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

The solar system's giant planets are famous for their ... For instance, few have a very red color. But the new study, published Sept. 4 in The Astrophysical Journal Letters, explains these ...

A solar explosion called a coronal mass ejection is poised to graze Earth on Friday or Saturday (Jan. 24 or Jan. 25), potentially triggering colorful auroras over the northern U.S. A powerful ...