How are galaxies formed? Astrophysicist Peter Laursen takes you on a step-by-step journey through galaxy formation – from primordial collapse to the formation of spiral arms.
What is a galaxy? What are they made of and how many different types are there? Astrophysicist Peter Laursen explains.
Black holes slow formation of new stars New discovery helps us understand why galaxies have fewer stars than they're supposed to.
