The solar system is a dynamic place, and objects located 180° from a planet don’t stay that far from the planet for long. The reason is the differences in their orbits. Orbits come in all shapes and ...

A seismic shift occurred in astronomy during the Scientific Revolution, beginning with 16th-century polymath Copernicus and his proposal that the Earth revolved around the sun. By the 17th century, ...

At the right point of the orbit and stellar cycle, the star’s chromosphere brightens.

Southwest Research Institute scientists propose a new model for the formation of compact exoplanetary systems that contain multiple rocky planets in tight orbits around their star. In this model, ...

EVANSTON, Ill. — Except for the fact that we call it home, for centuries astronomers didn’t have any particular reason to believe that our solar system was anything special in the universe. But, ...