Andromeda XXXV is only about 20,000 times more massive than our Sun—very small, even for a satellite galaxy. For comparison, ...

When we observe distant celestial objects, there is a possible catch: Is that star I am observing really as reddish as it ...

Dark matter continues to confound us, so far defying every attempt to decipher it. According to a new study, clues may lurk ...

Gravitational lensing often evokes images of a cosmic funhouse mirror: duplicated galaxies, dramatic arcs and distorted ...