In the frozen outskirts of the solar system, a reddish dwarf planet orbits in silence. Known as Sedna, it is so distant that one trip around the Sun takes more than 11,000 years. For much of that time ...

Here’s what you’ll learn when you read this story: Roughly three times smaller than our Moon, Sedna has an extremely narrow and elliptical orbit, making its closest approach to the sun (perihelion) at ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

Sedna, a distant dwarf world once dubbed “Planet X,” is making its closest approach to the Sun in centuries — a narrow window between 2075 and 2076 that could allow a spacecraft to reach it using ...