Scientists are preparing for their best look at it yet.

A swarm of giant city-killer asteroids hiding near Venus poses an “invisible threat” to life on Earth, astronomers have warned in a new study. These space rocks, known as co-orbital asteroids, tag ...

Somewhere in the orbit of Venus, scientists believe a hidden population of asteroids is circling the Sun—nearly invisible to Earth-bound telescopes and possibly capable of striking our planet with ...

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