"All the odd shapes and swirling gas observed in the Perseus cluster now make sense within the context of a major merger." Astronomers have discovered a long-missing element of a galactic ...

Dwarf galaxies, small yet mighty, are the most common galaxies in the universe—and crucial to understanding the growth of cosmic giants. Some galaxies had ghostly streaks of light near their ...

Astronomers have discovered a long-missing element of a galactic collision involving the Perseus galaxy cluster, located 240 million light-years from Earth. This element, a newly detected ...