In January of 2005, astronomers discovered a distant object larger than Pluto orbiting the sun. However, since there is no authoritative definition for the term planet, disagreement exists between ...

Remember when we thought our solar system might be unique in the universe? When we had no evidence--other than maybe a gut feeling, a hunch--that there were other planets beyond our solar family? It ...

Proxima Centauri, the sun’s nearest neighbor among the stars, is 25 trillion miles away from Earth. Even if it had a family of planets, no telescope could reveal them. According to Sir James Jeans, a ...