These linkups happen when several planets appear to line up in the night sky at once. Such parades are fairly common, ...

Beyond the familiar planets lies a fascinating frontier filled with icy worlds, mysterious orbits, and cosmic curiosities.

But it’s not just looks. Rocky composition, general size, orbital behaviors—a lot of those qualities can be the same on both ...

How do tidal forces shape a planet's orbital evolution, especially for those in the habitable zone? A recently submitted ...

Scientists’ model indicates that dark matter inside gas giants could collapse into black holes detectable by observation.

On Aug. 24, 2006, the International Astronomical Union (IAU) decided that Pluto wasn't a planet anymore. Instead, Pluto is ...

Without other planets or the Moon, Earth would lose tides, gravity stability, and the conditions necessary for life.

Get ready for the rare 'planet parade' on August 25, 2025! Six planets, Saturn, Jupiter, Venus, Mercury, Uranus, and Neptune, ...

Researchers suggest gas giants might gather dark matter until their cores collapse into planet-sized black holes.

In February 2025, a stunning planetary alignment–also known as the planet parade–allowed observers to see seven planets in the night sky simultaneously: Mercury, Venus, Mars, Jupiter, Saturn, Uranus, ...

Astronomers have glimpsed the inner structure of a dying star in a rare kind of cosmic explosion called an "extremely ...

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...