Mercury doesn't give up its secrets easily. The smallest planet in our solar system is also one of the most extreme—a ...

A pair of European satellites have created the first artificial solar eclipses by flying in precise and fancy formation, ...

How Many Planets Are There in the Solar System? There are 8 planets in our solar system. The planets orbit the Sun in ...

More than 150 moons orbit worlds in our solar system. Known as natural satellites, they orbit planets, dwarf planets, asteroids, and other debris. Among the planets, moons are more common in the ...

These ancient swarms, which orbit the sun alongside the giant planet, may hold clues to the solar system’s original layout. Photograph by PATRICK H. CORKERY, LOCKHEED MARTIN Launched in 2016 ...