How are star systems, or entire galaxies, born? How and why do billions of stars start spinning around the same center? Does it happen all at once? Or slowly over a long time? These are big questions with lots of big answers. How do we know which answers are right?
We can watch galaxies at many stages as they are forming. But it’s not easy, because they’re very far away.
The Hubble Space Telescope, or HST, has seen fuzzy blobs that might be galaxies being born. Remember, looking at the universe means looking back in time. HST has seen galaxies as they were billions of years ago. By studying many galaxies of all ages, scientists can learn how they take shape.
