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

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

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

The planets in our solar system orbit the sun essentially along a line across the sky in a plane called the ecliptic. For that reason, planets in our Earthly sky always appear somewhere along a ...

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

"Uranus and Neptune, two very distant ice giant planets out in our solar system, are also there in ... Saturn will appear as a yellowish-white body with moderate brightness, according to Space.com.

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