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"picture of the day", 1 year ago: "shows 2 galaxies in the early Universe. The brilliant #explosion on the left is a #gamma-ray burst. As the light from the burst passes through the 2 galaxies on the way to Earth (outside the frame to the right) some colours are #absorbed by the cool gas in the galaxies, leaving characteristic #dark lines in the spectrum. Careful study of these spectra has allowed astronomers to discover that these two galaxies are remarkably rich in heavier #chemical elements." https://commons.wikimedia.org/wiki/Image:Artist’s_impression_of_a_gamma-ray_burst_shining_through_two_young_galaxies_in_the_early_Universe.jpg cc @question
