Earth spins as it orbits the Sun, and the solar system is orbiting the galactic center. So, if I go outside and look up, in ...

Mars will also reach opposition this month, which means the planet will be on the opposite side of Earth from the Sun, forming a straight line with other planet ...

Billions of years ago, in the frigid outer reaches of our solar system, two icy worlds collided. Rather than destroying each ...

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Learn about the size, temperature, and colour of each planet, and discover why Pluto is no longer considered a planet.