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.

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

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

It is not often that all the planets in the Solar System other than ours are lined up across the night sky for us to see.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

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

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

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

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

This provides another piece of the puzzle to understand how planets and ... New studies offer a clearer picture of how the outer solar system formed and evolved based on analyses of trans ...