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 ...

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 ...

They developed a 3D model that simulates how the solar system's orbital architecture may ... With each mass, she modeled 2 million years of orbit to find what kind of architectural impact each ...

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

New research suggests that a massive, unidentified object might have passed through our Solar System billions of years ago, leaving a lasting imprint on the orbits of our planets. This intriguing ...

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.

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 ...

Kuiper Belt, well past the orbit of Neptune (artistic illustration). There may be an undiscovered planet in the outer solar system whose presence is revealed by the strange orbit of objects beyond ...

Billions of years ago, in the frigid outer reaches of our solar system ... Denton said. This model worked well for the Earth-moon system, where the intense heat and larger masses involved meant ...