Astronomers report no companion found for S2, the star orbiting near our Milky Way's central black hole. It's an "all-clear” for an exciting test of Einstein’s Theory of General Relativity.
NASA's Parker Solar Probe, launching this summer, will travel closer to the sun than any spacecraft yet - and you can send your name along for the ride. Hear about it from William Shatner.
It’s potentially one of the most exciting astronomical discoveries of the decade. Astronomers have detected a signal from the 1st stars to form in the universe.
Expand to full size to see this video from ESA’s Mars Express spacecraft, which caught a close-up view of the little Mars moon Phobos, moving in front of distant Saturn.
They used a radio telescope to peer back to a time only 180 million years after Big Bang - when the 1st stars were turning on - to observe the earliest-yet signals of hydrogen gas.