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

Starting at 12:30 p.m. ET (1730 GMT) on Saturday (Jan. 25), astrophysicist Gianluca Masi of the Virtual Telescope Project ...

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

Two new studies show a briny, carbon-rich environment on the parent body of the Bennu asteroid was suitable for assembling ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

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

In this video, we break down the scale of our solar system by starting with the Sun and comparing it to everyday objects. It’s a journey from the heart of our solar system to the farthest ...