Because that's how long it takes to orbit the sun when you're that far away. Tim Peake introduces Dallas Campbell. Dallas shows an orrery – a mechanical model of the solar system. Before the ...

Narrator: Serious scientists, like myself, believe our solar system was ... they orbit the Sun, which is actually a star. This theory was known as the heliocentric model. It was controversial ...

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

The eight planets in our solar system orbit the sun in roughly the same plane, because they all originally formed from the same disc of debris around the sun. The line the sun traces across the ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

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.

New research suggests that a massive, unidentified object might have passed through our Solar System billions of years ago, ...

Emily Simpson, a passionate space enthusiast and recent Florida Tech graduate, has published groundbreaking research that imagines an alternate version of our solar system. Instead of the asteroid ...

A close encounter with a mysterious interstellar object could explain the current orbits of several of Earth’s largest ...

Planets in our solar system orbit the Sun in different orbits in three-dimensional space. Scientists have claimed that an interstellar visitor, much larger than any celestial body in our solar ...