Where does earth end and space begin? Finding the border between the two is not as simple or scientific as you might think
Onward to Europa
The oceans of Jupiter's ice worlds might be swimming with life — so why do we keep sending robots to Mars?
Growing up alien
John Mack was a Harvard scientist who took extra-terrestrial abduction seriously. Is he the reason I like misfits?
Dark side of the moon
Like evangelists, astronauts travel far and return with glad tidings. But however high they ascend, they’re only human
The calibrated cosmos
Is our universe fine-tuned for the existence of life – or does it just look that way from where we’re sitting?
Embracing the void
The ancients had pyramids to tame the sky's mystery. We have Star Axis, a masterpiece forty years in the making
Scientists used to scan the skies for messages from alien civilisations. Now they go looking for their ruins
Catching the stars
Roger Angel is one of the world's most brilliant and audacious engineers. Could he design the next energy revolution?
Are we alone?
The universe seems to be bursting with planets, and this is profoundly important — but not in the way we might expect