Description and explanations of astronomical phenomena and measurements related to the Solar System and exoplanets. Structure and evolution of planetary systems. Formation of solar systems and planets ...

Researchers have believed that Segue 1, a puny galaxy orbiting the Milky Way just 75,000 light-years away, was packed with dark matter, a substance in space that doesn't shine or interact with light.

QUINCY — After making a minor adjustment to a telescope focused on Saturn, Quincy High School junior Conall Wolfmeyer offers some advice to a classmate. “Look through the eyepiece. You might need to ...