Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

Located less than 20 light years away, HD 20794d could potentially be one of the most Earth-like planets found so far, ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

The risk of impact is likely to drop to zero as observations of Asteroid 2024 YR4 continue.

Researchers say there’s a 1.3 percent chance that the space rock 2024 YR4 could strike our planet — but not until December ...