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

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

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 ...

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

The planet Uranus takes about 84 Earth years (or 30,688 ... These forces can become very large when the objects have a high mass, like stars, planets or moons. As well as holding planets and ...

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.

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

New observations by the James Webb Space Telescope suggest that an icy moon around Uranus may have an underground liquid ocean. Ariel is one of 27 moons around Uranus, the seventh planet from the ...

A planet-sized visitor possibly visited the solar system billions of years ago and permanently changed the cosmic neighbourhood by warping the orbital path of four outer planets of the system, a ...