Ellipticals and spirals comprise two different populations of "green" galaxies
Tuesday, February 25, 2014 - 10:30
in Astronomy & Space
We keep saying this: the universe is more complex than it appears. Conventional thinking in galaxy research postulates that spiral galaxies have star-forming areas, while ellipticals do not due to a lack of gas. While this thinking has been debunked, there's now emerging research showing a "green valley" of galaxies somewhat in between these two types.