It's measuring the highs and lows of our planet.
One of Hawking's earliest surviving wheelchairs and his groundbreaking doctoral thesis are up for auction in London.
Dark energy may be decreasing, which puts a crimp in the notion that the universe will expand forever.
Hurricane Florence caused huge problems with pollution and runoff in rivers, which these stark NASA images reveal.
The signal extends over a huge swath of space, an area that's 2.5 times bigger than the orbit of Pluto.
The longest total lunar eclipse of the century is coming up in a couple weeks. We know it's coming, but did ancient people?