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

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

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

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

The great planetary parade in February 2025 will see five bright planets in clear view and a special alignment of Mercury and Saturn ...

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Mercury takes only 88 Earth days to orbit the sun.

Astronomers discovered the gas giant planet — dubbed a "hot Jupiter " — in 2016, but have continued to investigate this ...

To better understand why the planets have variable compositions ... to the formation of the gas and ice giants in the outer solar system. This first-order model of planetary growth in the solar ...

Starting up again Saturday, a sweeping view of our solar system will glow in the night sky. The planetary alignment, or a ...