The signal came at 18:16 GMT. Rosetta, the comet-chasing space probe launched by the European Space Agency a decade ago, had woken up.
The vessel is being woken, hopefully, by the 'most important alarm clock in the solar system'
The Webb Space Telescope is scheduled to launch in 2018, building upon the work of the Hubble Space Telescope to look even deeper into the Universe - see below for pictures of this incredible and complex device
Photos capturing the Nasa Challenger space shuttle disaster of 1986 have been discovered in an attic.
The firm hopes to take first ever tourists to space later this year. Onboard cameras were able to capture its rocket-powered engine, the first time it has been used
Lap of the Planet is due to air in March with two other space spin-offs planned
NuSTAR captures dead star and distant black holes
A coronal mass ejection two days ago could make the aurora visible
It is also expected to discover thousands of previously unknown objects
A failure in the coolant system last Wednesday led to the shutting down of all nonessential systems, though Nasa reports the astronauts are safe and comfortable
Molecular ions of argon hydride were detected in supernova remnant
Dylan’s gloriously jagged pursuit of a restless muse
Scientists believe life may exist within underground ocean - living off minerals and using tidal heat as a source of energy
The latest in the series goes up against Forza 5 - but which is the better racer?
Nasa said crew are safe and experts are working to troubleshoot the problem