NASA's Advanced Composite Solar Sail System (ACS3) will be visible from the ground. Find out when you can see it on the NASA app on a mobile device. Credit: NASA/JPL-Caltech ...

Large galaxies, like the Milky Way, attract smaller galaxies. Our solar system 's cosmic neighborhood spans 100,000 ...

Like other stars, the sun will eventually run out of energy and end up engulfing mercury and venus, possibly earth as well. The sun is about 150 million kilometers away from the earth.