The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

Six planets are part of the alignment, which will last until Feb. 18. Mercury will join the alignment later in the month.

The four planet-strong "planet parade" currently visible to the naked eye in the night sky for a short time after sunset will ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show ...

Dr. Jane Huang's research on planet formation in harsh environments, particularly within the Sigma Orionis cluster, offers ...

Canadian astronomers have taken an extraordinary step in understanding how planets are born, using the James Webb Space ...

These embryos, somewhere between small planetesimals and fully formed planets, were abundant during the solar system's formative stages and played a critical role in planetary formation.

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.

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

Jan. 15, 2025 — New observational data and simulation models have confirmed a new type of planet unlike anything found in the Solar System. This provides another piece of the puzzle to ...