Among the thousands of galaxies in this image of the Hubble Ultra Deep Field are the 36 so-called "tadpole" galaxies identified recently by astronomers. The green squares mark these galaxies, which existed billions of years ago. They are called tadpoles because of their distinct knot-and-tail shapes, which suggest that they are engaging in galactic mergers.
Object Name: HUDF
Image Type: Astronomical/Illustration
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