Even more exciting, the model suggests that some Earth-like planets could form in the habitable zone—the region around a star ...

Pollard A quartet of Earth-like worlds, each about 20% to 30% the size of our planet, circle one of our closest ... Barnard's ...

Venus could make a brief appearance this weekend as it passes between the Earth and the sun. Just be warned: It won't be easy to spot in the sun's glow, according to astronomers. The orbit Venus ...

Venus will pass between the Earth and sun on Saturday during what's called an inferior conjunction. The moment of conjunction will happen at around 9 p.m. EDT, but don't plan on seeing the linkup.