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.

Most people hear “spacecraft” and envision rockets blasting into space, but they’re often not aware of the meticulous ...

The object in question is believed to be an interstellar visitor, meaning it originated outside of our solar system and ventured into the depths of our cosmic neighborhood. Such objects are rare ...

The theory gained traction as observations revealed a relative void of interstellar dust near our solar system ... paints a ...

Here’s how it works. A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets ...

For decades, scientists have marveled at the Local Hot Bubble—a vast, low-density region stretching roughly 1,000 light-years ...

IMAP-Lo was built to collect and analyze invisible particles — neutral atoms — that make up the interstellar medium ...

Researchers believe rogue planets, formed by gravitational ejections during early solar system evolution, may outnumber stars and frequently drift through interstellar space. Every million years ...