A day is how long it takes a planet to rotate fully, and a year is ... of the distant Solar System that we know about, such as the Kuiper Belt. It's all good and well knowing facts about space ...

The sun’s constant magnetic activity builds over an average 11-year cycle ... tally up to $2.6 trillion just in the U.S. It’s ...

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

Despite common assumptions, the disk of our Solar ... way of our system’s formation. Our s is thought to have emerged from a nebula—a gargantuan cloud of dust and gas—about 4.6 billion ...