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

The eight planets travel around the Sun at different speeds ... The Milky Way is a spiral galaxy and our Solar System is about half-way along one of its arms. Our Sun orbits the centre of the ...

The planets in our solar system orbit the sun essentially along a line across ... closely to each other in the sky "while they careen around the cosmic racetrack," according to NASA.

Many stars in our galaxy exist in pairs. Now scientists are finding clues that our Sun may once have had a companion of its own. The question is, where did it go?

"As the sun becomes a red giant, the habitable zone will move to around Jupiter and Saturn's orbit, and many of these moons will become ocean planets," Zhang said. "I think, in that case ...