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

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

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

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 ...

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

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

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

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

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 ...

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.

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...