You can see the green in a telescope because it's a green comet. Our retina has rods and cones and the rods are sensitive to shades of gray. The cones are sensitive to color, but they require higher intensity light in order to get triggered. So dim comets, no matter what color they are in a telescope, typically you don't notice that with your eyes unless you can see them through a big telescope.
Why does the universe exist? Neil deGrasse Tyson and comedian Chuck Nice answer fan questions about black holes, wormholes, the expansion of the universe and more! What are our options to solve the crisis in cosmology?
NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here: https://startalkmedia.com/show/cosmic-queries-why-are-we-here/
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Photo Credit: NASA, ESA, M. Robberto (Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team, Public domain, via Wikimedia Commons
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