Dark matter living in galaxy clusters doesn't splatter when the galaxies collide, according to new research. The finding suggests dark matter particles, whatever they are, are not part of a "dark sector" that mirrors our own universe.
They may be little, but they pack a big star-forming punch. New observations from NASA’s Hubble Space Telescope show small galaxies, also known as dwarf galaxies, are responsible for forming a large proportion of the universe’s stars. Hiding among.