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

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

For Neptune, in its wide and distant orbit at about 30 AU, the difference between the perihelion and aphelion is 0.5 AU, according to the Royal Greenwich Observatory. Dwarf planet Pluto ...

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

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

HELENA — The planets are aligned. Six planets, Mars, Jupiter, Uranus, Neptune, Venus and Saturn can be seen in the night sky.

Four planets will be in the parade in January, while seven will align in February. Here's how to see the events.

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...

The case of mistaken identity was quickly resolved, but astronomers say it shows the need for transparency around craft in ...