An international team of planet hunters has found four new planets orbiting two nearby stars that are very similar to the Sun. These discoveries point the way to the detection of potentially habitable ...

A new study has found that an asteroid NASA used for target practice a few years ago was nudged into a slightly different ...

However, what constitutes a planet in particular is a question that may seem very simple but has been escalating in complexity as scientists discover new planets that defy the classical definition.

If you have a clear view of the night sky at the end of February, you'll be able to see all the planets in the solar system with the naked eye, lined up in a "planetary parade." But what would these ...