Long ago, a planetary object eight times the mass of Jupiter may have once visited the solar system and altered […] The post ...

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

Stargazers will be treated to a dazzling six-planet "alignment" this January.

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

An unidentified interstellar object, possibly eight times Jupiter’s mass, may have disrupted the solar system’s planets.

In case anyone missed the January planetary alignment, two more are expected to be seen in the night sky in February, with ...

In 1986 and 1989, Voyager 2 made the final two stops on its grand tour of the outer solar system when it swept by Uranus and Neptune ... which are not that far apart in mass, are not dipolar.

A handful of planets in the solar system are expected to line up in the night sky for a few days in January 2025. Here's when ...

Unfortunate timing The first panel of this artist's concept depicts how Uranus's magnetosphere – its protective bubble – was behaving before the 1986 flyby of NASA's Voyager 2. The second panel shows ...