“He was very taken with the thought that no phenomenon becomes a true phenomena until it has been observed,” Wald told Salon ...

Researchers believe that a supernova in our galaxy could reveal the secrets of dark matter by emitting detectable gamma rays from axions. This discovery would provide key insights into the elusive ...

Galaxies like the Milky Way grow by merging with smaller galaxies over billions of years, unlike dwarf galaxies, which have long been thought to lack the heft to attract mass and grow in the same way.

Recent research has unveiled a troubling and persistent mystery at the heart of modern cosmology: the universe is expanding ...