Galaxy Shapes in an Attic
Pale Blue Pod
00:00
Is There a Difference Between Blue and Red?
Astronomers classify galaxies by their size, color and the wavelength that we observe them in. We sometimes refer to galaxies as blue versus red. A blue galaxy is very young with lots of newly formed stars that are shining blue. I would never think of red as cooler. It's actually a constant struggle when I'm doing my science communication... Do I make blue hot or cold? Because to my astronomer brain, blue isVery energetic,. But to my normal human brain, blue means cold.
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