The Solar System is very tidy. You have four rocky planets near the Sun, and four gas giant planets further away. An asteroid ...

1 AU is the average distance between the Earth and the Sun and is approximately equal to 150,000,000 km (or 1.5 × 10 11 m). Distances between the Earth and other stars and galaxies are measured ...

For centuries, humanity has gazed into the stars, pondering the distances between solar systems and the vastness of space. But the universe is more interconnected than we once thought. Alpha ...

planets in our Solar System and other planets far off in outer space. From up here on the International Space Station I get a great view of Earth. Our planet is just the right distance from the ...