Astronomers keep discovering what type of massive, yet young, galaxy?
Big baby galaxies
That’s right, the scientific community refers to these young galaxies, viewed through the Hubble and Spitzer Telescopes as “big baby galaxies” because of their massive size and comparative age. Scientists used to believe that young galaxies must be small, but these galaxies are very large — much bigger than our Milky Way. This has changed astronomers’ idea of how galaxies function.
Answer: The correct answer is Big baby galaxies.