Opinions expressed by Forbes Contributors are their own. I cover aerospace, astronomy & hosted The Cosmic Controversy Podcast. At least 50 billion planets in our own Milky Way galaxy are likely to ...

On February 28, all seven planets viz., Saturn, Mercury, Neptune, Venus, Uranus, Jupiter, and Mars will neatly align in the sky in what scientists are terming a rare planetary coincidence.

In 1992 astronomers reported the first planet-size masses around a dead star ... development of three main detection techniques, which all involve both ground- and space-based observatories.

The Sun’s gravity holds all of these objects together ... rocky objects that orbit the Sun and vary in size from 1km to around 1000km. Like planets, asteroids are mostly made of rock and ...