Galactic position system

We can point to our home on a globe and find Earth in a model of the solar system but where are we in the Milky Way?

by 2800 2,800 words
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Detail from Starry Night (1888) by Vincent Van Gogh, Musée D'Orsay, Paris. Photo by Getty Images

Detail from Starry Night (1888) by Vincent Van Gogh, Musée D'Orsay, Paris. Photo by Getty Images

Sarah Scoles is associate editor at Astronomy magazine. She lives in Milwaukee, Wisconsin.

Every few months, the artist Jon Lomberg kneels next to a croton plant, removes the cheap earring that pierces a speckle on one of its leaves, and fastens a new yellow stud into the same hole. This, he says, pointing to the stud, represents the Sun. He is standing 30ft from the middle of the 100-ft-wide Galaxy Garden in the Captain Cook district of western Hawai’i. The highly manicured garden is an accurate scale model of the Milky Way galaxy, where every step takes you 2,000 light years from where you stood before. Here, the speckles on the leaves of ‘gold dust’ crotons stand in for stars. The plants reach out in spiral arms from the garden’s centre, where a spouting fountain plays the part of a monster black hole. Along the spiral limbs crowd hibiscus, vincas and red and black crotons where nebulae, gas and dust belong.

Jon Lomberg's Galaxy Garden. Photo by Heidy and Pierre Lesage© 2010/ Jon Lomberg's Galaxy Garden. Photo by Heidy and Pierre Lesage© 2010/

When Lomberg stands up, his Milky Way makeover finished, he looks down at our yellow star. The garden’s opposing edge is 70ft away, the distance filled with other speckled leaves. ‘You put a basketball around where Earth is, and everything you’re going to see in the night sky is in that ball,’ he says, adding that other stars are too distant and dust-dimmed. ‘When you see the whole garden,’ Lomberg continues, ‘without any math, or any need for explanation, the scale becomes apparent.’

It is difficult to picture ourselves in the Milky Way. We have no problem placing ourselves within, say, California, or the United States. Even second-graders can point to a spot on a globe and say: ‘I live there.’ And by third grade, they can position that globe in a neat line of planets, telling you smugly that those worlds orbit the Sun, a next-door version of the points of light in the night sky. But beyond that, what? Everything is so distant that we often lump it all into the ‘out there’ category, so that Pluto and Polaris might as well be in the same spot. Perhaps that’s why, as Lomberg says, many people erroneously use galaxy and solar system as synonyms.

Only in the past few decades have we become scientifically and technologically advanced enough to situate ourselves within the 100,000-light-year-wide wilderness we call home (where one light year is a distance equivalent to 6 trillion miles). But making heads or tails of galactic latitude and longitude isn’t easy for anyone, including astronomers. We were born inside the Milky Way, and (spoiler alert) we will all die inside the Milky Way. Imagine being trapped inside a building and trying to determine what it looks like from the outside – its layout, when it was last painted, tin roof or shingled? You can catalogue half baths, peer out of a window and describe awnings. But assembling those pieces into a gestalt is like trying to understand your brain using your brain. You’ll never have an aerial view.

Now imagine you’ve never heard of this strange concept of ‘building’. That’s the situation astronomers found themselves in until the 1920s. The Milky Way has always streaked our sky, a diffuse stripe spreading from horizon to horizon. Its Latin name – Via Lactea – comes from this fuzzy lane-like appearance. But it wasn’t until Galileo Galilei trained his telescope on it 400 years ago that we knew for sure that it was made of stars – stars just like Sirius, but much further away.

As centuries passed, telescopes grew larger, allowing astronomers to detect fainter objects. Looking deeper into space than ever before, they began to see strange helical clouds. Thinking that they were just baroque clouds of gas within our own galaxy, astronomers called them ‘spiral nebulae’. After all, if you don’t know an object’s true size, it could be small and nearby, or distant and huge. And in the late 19th century, the proximate cosmos was the whole cosmos.

We had long ago learned that Earth is not the hub of the solar system, but it was the helical clouds, and an argument known as the Great Debate, that pushed the Milky Way off its pedestal. Heber Curtis, director of the Allegheny Observatory in Pittsburgh, suggested in 1920 that the galaxy is just another spiral nebula – simply the one we happen to inhabit. Each other nebula is an ‘island universe’, a Milky Way beyond the Milky Way.

On the other side of the debate was Harlow Shapley of the Mount Wilson Observatory in California. If each nebula is an ‘island universe’, he said, the closest – Andromeda – would be millions of light years away. We now know, of course, that Andromeda is an island universe, and that it houses more than a trillion suns. So do other galaxies 13 million, even 13 billion, light years away. Not only is the Milky Way not the entirety of the Universe, it’s not even a remarkable galaxy. The good news is, this ordinariness is what gives us a chance to describe our ‘building’ from the outside.

We can count on the Milky Way to look and behave like an average spiral galaxy, and the Universe contains tens of billions of those. Wherever we look in the Universe, we see the laws of physics – the strong and weak nuclear forces that make atoms tick; the electromagnetics that attract opposites; the gravity that orders orbits – moulding gas into stars, and stars into galaxies. Peering out of our cosmic window, we can survey these structures to learn about our own. If the spiral nebulae we see have arms and bulges, perhaps the Milky Way sports them, too.

From the side, the Milky Way is a thin disk with a bulge in the middle. From above or below, it resembles a hurricane, with spiral arms where rain bands would be. Four of them curl from the eye of the storm. The Perseus Arm and, interior to it, the Sagittarius Arm wrap around our side of the Milky Way, while the Scutum-Centaurus and Norma-Cygnus arms form a near-mirror-image on the other side.

A stream of stars forms a curved lane between Perseus and Sagittarius. It is on this 15,000-light-year-long branch, called the Orion Arm, that our Sun sits. For a long time, astronomers believed the Orion Arm was insubstantial. Last June, however, they discovered our arm is a major appendage in its own right, more like Perseus and Sagittarius than like a minor spur.

That’s a pretty basic discovery to make so late in the game. But nearly all knowledge of galactic limbs comes from invisible parts of the light spectrum, studies of which are – relative to the optical astronomy that began with Galileo’s telescope – in their infancy. Until extrasensory telescopes augmented our anatomy, we couldn’t sense the spiral arms. Scientists didn’t discover them until the 1950s, with the first radio surveys of hydrogen gas. From these simplest atoms, radio waves 21cm long cut through the thick curtain of particles that stands between us and the other side of the Milky Way. Those particles block the visible light, but longer-wavelength radiation zips right past them, just as FM transmissions pass right through the walls of your house.

dark matter pervades the Milky Way – including the solar system and maybe the space next to you right now

Radio waves and infrared radiation also shed light on how spiral arms move and why they exist in the first place. Although their shape suggests that they rotate with the galaxy, carrying stars along with them, they move at their own pace, like terrestrial traffic jams. While cars bottleneck, they eventually crawl out the other side. The traffic overdensity itself, however, persists. And so do spiral arms, which contain about 10 per cent more stars and gas than the rest of the galaxy. The Sun’s slow passage through the Perseus-Orion jam will take some 10 million years in total. After that, our star will be in a limbless space for 100 million years.

All spiral arms lead to the Milky Way’s centre. There, a bar of stars in long, looping orbits forms the tapered shape of a cat’s pupil. This eye is 27,000 light years across – nearly as wide as the distance between Earth and the galactic centre – and pokes out of the galaxy’s plane at a 45º angle. Above and below this midsection, nearly 200 spheres, each packed with hundreds of thousands of ancient stars, orbit. Out of the Milky Way’s plane, these ‘globular clusters’ live their long lives in isolation from each other and the rest of the galaxy. If Earth were inside one of them, our night sky would beam down thousands of stars as bright as Sirius.

At the very centre of the galaxy, 27,190 light years from Earth, sits the Milky Way’s most significant object. Our fastest spacecraft would take 475 million years to arrive at its boundary, beyond which 4 million suns-worth of mass is squished into a singularity. This supermassive black hole, called Sagittarius A*, appears to orchestrate galactic motions, making every last atom its satellite, but this is an illusion. Everything orbits the centre of mass – the point at which the gravitation from all directions is the same. Just as the Earth spins on its axis and revolves around the Sun, the whole Milky Way whirls around the centre of mass. Even Sagittarius A*, very slightly offset from the galaxy’s true centre, does a delicate jig.

The region around the black hole is dense with dust, which blocks and scatters visible light. Because no optical telescopes could see to the centre, astronomers did not find evidence of Sagittarius A*’s existence until 1974, when radio telescopes became powerful enough to nail the precise location of a strangely compact source of radiation that coincided with the galactic bull’s-eye.

A disk of swirling material surrounds Sagittarius A*. Stripped from stars and gas clouds, these rub against each other as they move. The friction heats things up, causing the disk to glow with radiation. Sometimes, an unfortunate clump of matter falls past the black hole’s event horizon – the point of no return – and the only memorial is a burst of photons. In the 10,000 light years right around the black hole, 10 billion stars bulge in a peanut shape. When astronomers look at the farther-out orbits, such as that of our Sun, the motions don’t perform as expected. The speeds depend on distance from the galactic centre and the amount of mass inside the orbit. Given that we’re in the podunk part of the Milky Way, low-density and far from the middle, our orbit should be slower. But the Milky Way’s farthest-flung suburbs have the same pace as its New York Cities.

Vera Rubin, a researcher at the Carnegie Institution for Science in Washington DC, observed the same surprising motions in other galaxies in 1970. Here, dark matter enters the picture. To generate enough gravity to make the Sun orbit so fast, 80 per cent of the galaxy’s mass must be missing. Black as space, this dark matter pervades the Milky Way – including the solar system and maybe the space next to you right now – and forms a huge halo around the visible galaxy. And while this invisible cloak might be the most mysterious of the Milky Way’s shrouds, it is not the only one. A balloon of gas also envelops us, extending hundreds of thousands of light years beyond the galaxy’s visible borders – farther from the galaxy’s edges than the galaxy itself measures from edge to edge. If you could ball up this hydrogen, you could create at least 10 billion new stars.

Even more hydrogen streams in from extragalactic space. Clouds of high-velocity gas come from smaller, nearby galaxies after the Milky Way’s immense gravity re-routes them. One known as Smith’s Cloud weighs more than a million suns, but it’s spread so thin that it fills as much sky (or it would, if you had radio-sensing eyes) as the Orion constellation. When it arrives 30 million years from now, it will set off a burst of star formation. Snacks such as the Smith Cloud will allow the Milky Way to continue making new stars, even after it has consumed the food on its own plate.

The Milky Way sometimes likes to steal sustenance from the Large and Small Magellanic Clouds, which can be seen orbiting our galaxy on dark, clear nights in the Southern Hemisphere. But the theft does not go unavenged: the Magellanic Clouds might have turned the Milky Way into a warped and vibrating thing. As they move through space-time, they create a wake, just like rocks skipped across water. The undulations bump into our dark matter, bending the galaxy. Its edges flap and wave on timescales we can never experience.

The Berkeley astronomer Leo Blitz theorised the cause of this warp. A renowned galactic researcher, he also is the scientific consultant for the Galaxy Garden. Before Lomberg broke ground, he sought out Blitz to ensure the floral Milky Way would be accurate. Each landscaping choice he made represents years of graduate students’ lives, scientific collaborations spanning continents and decades, and terabytes (and terabytes) of archived data. This Hawai’ian garden is the only place where you can truly feel that you’re in the Milky Way, because here you are in the Milky Way. ‘You’re walking around, bending down, looking down, then looking up,’ he says. ‘It’s a sensory experience.’

If you stand where the Sun’s earring is and survey the fecundity around you, it’s easy to believe that you actually do live inside something larger than your world. Lomberg believes this cosmic swaddling – and the accompanying smallness – should be part of our mental toolkit.

While acknowledging that your speckishness in the galaxy can make you feel trivial, Lomberg insists that the crushing scale doesn’t have to squash your importance. ‘There’s really no such thing as big or small,’ he says. ‘There’s only bigger or smaller. In some contexts, the galaxy is a tiny insignificant thing. So if the galaxy is not significant, then is anything significant? I think that the answer is that either nothing is or everything is.’

If you zoom out of the Milky Way entirely, you’ll find 26 known dwarf galaxies orbiting us. It’s likely that 1,000 more are hiding out there, some nearly invisible, and made mostly of dark matter or cold hydrogen gas. Beyond them lie the other members of the Local Group. These galaxies, 54 of which are known, travel together through space, and their gravitational centre lies between our galaxy and its nearest large neighbour, the Andromeda galaxy. Around the Milky Way and Andromeda, 12 other large galaxies form a protective circle known as the Council of Giants. The gravitational tethers that bind these galaxies are strong enough to resist the dark energy that is pushing everything apart, and getting faster every femtosecond (or one quadrillionth of a second).

If you could see it from afar, the cosmos would look a lot like a brain: a collection of neurons, where each supercluster is a bright dendrite, and each filament an axon

The Local Group is part of the Virgo Supercluster, which contains more than 100 galaxy groups and clusters, but even this structure is cosmically insignificant. Just as Earth is one of many planets, the Sun is an average star, and just as the Milky Way is a predictable spiral galaxy, the Virgo Supercluster has 10 million massive siblings.

That number hardly means anything to those of us who are five or six feet tall, perhaps travel to a foreign continent once, and die when we’re 85 if we’re lucky. But imagine that the Galaxy Garden really is the galaxy: the visible Universe would be the size of Earth, and it would be immaculately landscaped with hundreds of billions of Galaxy Garden clones, all congregating in clusters and superclusters. Long filaments of gas and dark matter bridge superclusters, connecting them across voids. If you could see it from afar, the cosmos would look a lot like a brain: a collection of neurons, where each supercluster is a bright dendrite, and each filament an axon.

Our brains have fewer synapses than the visible Universe, but they’ve enabled us to situate ourselves within it. Lomberg envisions a world in which every third-grader knows where the ‘You are here’ label goes on a galactic map and can give you directions from there to the Scutum-Centaurus Arm. ‘The Milky Way is as important to your self-identification as the fact that you live on planet Earth, or you live in the solar system,’ he says. ‘We may be insignificant, but we figured out that we’re in a galaxy. For insignificant nothings, that’s pretty good.’

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  • Richard Sandilands

    Wonderfully mind-boggling, thank-you

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  • g_allen

    Very nice essay.

    I tend to agree about this business of people not understanding the scales of the cosmos. Most people seem to think planets are large objects that are relatively close to one another. Compared to interstellar distances this is true enough, but even the near planets are mind mindbogglingly far apart and moving extremely fast in relation to the Earth. But (to borrow a phrase from Douglas Adams.) is PEANUTS compared with interstellar space let alone intergalactic space.

    To borrow another axiom, "The universe is not only more wonderful than we imagine, it's more wonderful than we can imagine."

  • Dave

    People erroneously use galaxy and solar system as synonyms. Really? I've NEVER EVER heard anyone do this. Maybe it's just the US education system that allows people to make these mistakes?

    • Dr. Shekelstein

      Most likely religious people. Remember that these are the same people that think the Universe is 6000 years old.

      • Jimbo Jimbo


        • Dr. Shekelstein

          Did I upset you?

      • citicrab

        Right. Some of them also carry a PhD in math or theoretical physics.

        • Dr. Shekelstein

          "Some of them also carry a PhD in math or theoretical physics."
          And have no credibility or respect.

          • citicrab

            Sure. By definition.

          • Zaoldyeck

            Well, if they hold to a religious position that the earth is 6000 years old, they petty much have to be rejecting all of modern physics, chemistry, biology, geology, hell, I can't think of many sciences that doesn't directly contradict a 6000 year old earth.

            So since these people promoting it either must be blind to the world in favor of religious belief... By definition not acting as a scientist... Or must be outright lying to a gullible crowd saying things they know are wrong, hence dishonest liars, and by definition receive nono credibility or respect.

            At the end of the day, a 6000 year old earth is as insane as claiming that the earth is flat and that pictures from the ISS are all bold face lies.

            Young earth creationists are either blind, or dishonest, neither is a good quality for anyone in the sciences.

          • citicrab

            Judging from the number of reputable scientists who are also Christians, this kind of literal reading of the Bible is not part of their faith system.

          • Zaoldyeck

            Plenty of people are good holding some cognitive dissonance and scientists are no different. Many would even admit to some degree of cognitive dissonance.

            Young earth creationism, on the other hand, is an extreme position where cognitive dissonance alone is well insufficient to ever justify without either malice or actual stupidity.

            Religious belief can at least be put on a vague pedestal to never be approached. Young earth creationism directly contradicts basic facts of reality. It can bedismissedwithout a second thought, as can anyone prpromoting it.

            Let us never try to justify people who believe in that.

          • citicrab

            Indeed don't let us. At the same time, do not let us forget that, to hold extreme anti-science views, you do not have to be religious at all; in fact you can be a highly educated person. Witness anti-GMO and anti-inoculations zealots. The latter, at least, are as irrational as young earth creationists, but far more destructive.

          • Zaoldyeck

            I might agree that anti innoculation zealots probably have caused more damage... But I'm not sure. Especially since we don't have anyone in congress promoting anti-vac legislation, but people like Paul Braun serves on the house committee on science and technology while believing evolution and the big bang are "lies straight from the pit of hell" and gets to set science funding appropriations.

            That is bad. Very bad.

            Also, while anti vac and GMO activists have limited scientific standing, only biology or biochem really make those people wrong.

            As I said, I can't think of many scientific disciplines that don't prove YEC wrong. Both deny science, but YEC is still egregiously erronious.

          • citicrab

            No so bad, him serving on the committee, no. Has he advocated a cut in NIH funding? As far as I remember, it went up dramatically under Bush, and has stagnated during the current administration (went down in real terms.) And Bush's personal beliefs may not have been that different from Braun's. Meanwhile God only knows how many kids - and their peers - have been put at risk by their ultra-progressive idiot parents. Finally, in terms of how wrong you can be, you can not go much higher than 100%.

          • Michael Hanlon

            It has occurred to me that Creationism is really a belief in a weird version of the Simulation Argument. Sure, everything about the Universe tells us it is billions of years old, but that doesn't matter, say the Creationists, because it is effectively a fake. Put there by God to resemble a 'real' universe of great antiquity. The question is, why the hell do they believe this?

            Creationism seems to have zilch to do with Christianity. I don't think Jesus mentioned the age of the Cosmos once (but then again nor did he mention homosexuals and clearly he had no problem with people drinking copious amounts of alcohol. He didn't like the rich much though).

    • g_allen

      It's done in movies all the time. I can't say how many times I've heard "that alien is from another galaxy!" in a Science Fiction film.

      • Michael Hanlon

        But he MIGHT be from another galaxy ... the nearest bits of Andromeda are only 20 times further away than the furthest bits of the Milky Way ...

        • g_allen

          Monkeys might also fly out of my bunghole. ;) The point being that a person mistaking a galaxy for a solar system is like mistaking the corner drug store for Greenland. It's such an unbelievable mistake that even if the rest of the film were well written and used (some) established science and engineering, it would stain the entire story.

          [HERO] "Oooo! The monsters came from another galaxy!" [ME] "groan!"

          • Michael Hanlon

            But again, it is sci-fi. Aliens are allowed to be from another galaxy if, you know, it's all made up ...

          • g_allen

            I'd agree, other than that nagging little "internal logic problem." If you establish that your spaceships/brooms/teleporters or other magical devices can get your heroes to another star system and into trouble in a few hours. Then you also toss in that you can go to the Andromeda galaxy in the same amount of time, you've effectively said that there is no consistency in your made up stuff and we should just roll credits and quit.

            Remember Star Trek TOS? They ran into some folks from Andromeda including a very hot chick in a halter top. During the various plot complications it was revealed that that the Andromedans were not remotely human (or hot) and it would take the Enterprise generations to get there even after they souped up the engines and made everyone into plastic tetrahedrons ( Love writing stuff like that, it sounds so retarded these days! )

          • Michael Hanlon

            Logic-schmogic. As I understand it, the Enterprise has a top speed in excess of 100 million times the speed of light. This means it can indeed zip from star system to star system, in minutes or hours. It also puts Andromeda about a week away ... unless, of course, the engines cannae take it ...

            Warp drives aside, a traveller in an ordinary rocket at near lightspeed will perceive his or her trip near instantaneously (even though for everyone else it will take ages). Get close enough to lightspeed and a human could indeed make a return trip in his lifetime to Andromeda (and see the hot chicks there) without breaking any laws of physics. Sadly everyone will be long dead on his return as the Earth will have aged 4 million years.

          • g_allen

            Well, Andromeda is like 2.5 million LY away while the Milkyway Galaxy is (only) 100 k LY across.

            You are probably right though. Despite all of the cannon geeks out there, I don't think they ever got Star Trek's propulsion nailed down other than it's bloody fast and violates teh laws of physics,.

          • Michael Hanlon

            It's certainly bloody fast. I'd always assumed it was a modified form of Alcubierre Drive, with the 'Dilithium crystals' fulfilling the requirement for exotic matter. Of course the Alcubierre Drive was not thought of until 1994, 25 years after the Enterprise was conceived. But happily Start Trek is pretty comfortable with time travel too ...

          • g_allen

            I doubt that the writers of Star Trek in 1968 really thought very hard about 'how' the magic FTL drive of the Enterprise worked. The point is however that Roddenberry or somebody associated with that project made an attempt to create a believably framework to get our heroes into trouble each week. The other point is, they didn't make the mistake that I see on so many other space opera movies. Of low-balling just how big space really is and the unforgivable error of confusing galaxies and solar systems.

    • Bearpants42

      US public school teacher here. We're busting our butts every day to teach your kids the correct info. Perhaps you could look at our broken culture and a fetishisation of ignorance in our arts and entertainment instead of constantly bagging on the last bastion of opportunity left in the country. Thanks!

    • Michael Hanlon

      Not been through it (the US education system), but I have never met an American ignorant of the difference between a solar system and a galaxy.

  • Jonathan McDowell

    A good test of a Real Astronomer (TM): ask them to point to where the galactic center is right now - especially if it's daytime. (Hmm, I should add this to the intern program)

    • JimCummings

      Nice. this is something I'm just beginning to work on (staying aware of the the hidden starscape that the sun is passing in front of, thanks to our place in our orbital dance around it). A recent, still-early attempt to evoke some of this:

    • Michael Hanlon

      And don't let them use their smartphone to help.
      An even better test is 'point to Jupiter' ...

  • panamaman

    Great, great article! Thank you! Regarding the comments on religious perspectives commented here, I find these discoveries only solidify my belief in a creator. I can't believe the incredible vastness, mathematics, and perfection of it all is happenstance. Current religious dogmas appear more and more rudimentary as we discover more about the universe.

  • Felix Erwin

    The galactic garden is quite fascinating. How big is the hand that tends it? Anthropic Principle or Garden of Eden? I contemplate a significance that can contain it all.

  • Michael Hanlon

    To illustrate how big (and empty) space is, imagine our Sun is a tiny grain of sand. Alpha Centauri is another grain of sand - two miles away.

  • John Jacobs

    Is the milky way a spiral galaxy or a barred spiral galaxy?

    • Michael Hanlon

      Probably the latter I think ...

  • tomdel

    Great article, but our brains DO NOT contain fewer synapses than the known universe. In fact, the number of synaptic connections in the human brain greatly exceeds the number of elementary particles in the visible universe.

    • Bob

      By definition that is not possible, as each connection requires atoms.