NASA has been monitoring a never-before-seen planet in its solar system, which is eight times the size of Earth.

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

These illuminated dust pockets help astronomers understand how stars interact with their surroundings, especially how dust ...

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Temperamental' stars that brighten and dim over a matter of hours or days may be distorting our view of thousands of distant ...

NASA's powerful James Webb Space Telescope has captured grains the size of a single bacterium that'll likely transform into planets.