When NASA launched the Pioneer probes, they were met with an intriguing mystery. At around 20 astronomical units, both ...

Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around ...

Dark matter refers to material that does not absorb, reflect, or emit any electromagnetic radiation. Astronomers have ascertained the existence of dark matter through the gravitational influence it ...

Our solar system is a weird place. Much more than a home to eight planets, it’s filled with a myriad of fascinating other smaller bodies, including moons, asteroids, and comets. In recent decades, ...