(Image: NASA/MSFC/David Higginbotham/Emmett Given)
When the James Webb Space Telescope unfurls its mirror a million and a half kilometres out in space four years from now, it will be the culmination of nearly two decades of planning by John Mather. He tells Anil Ananthaswamy about the challenges of building an heir to the stunningly successful Hubble Space Telescope
Why do we need the James Webb Space Telescope, when Hubble is still up there?
The short answer is that Hubble has tantalised us by showing us signs of things that would be really exciting to know about, but are just…
