Asteroids that orbit close to the Earth inevitably cause us some anxiety due to the even remote possibility of a collision.

Geomagnetic storms also cause problems on Earth. The electric currents they create can overload power plants and cause ...

Alas, the miracle could not last. The solar storms were heating Earth's upper atmosphere, causing it to inflate and increase ...

The four-planet lineup that began in January concludes by mid- to late February, as Saturn sinks increasingly lower in the ...

Tonight starts a great week of star gazing. Here's when to watch the full moon next to Venus, and a rare planetary parade ...