An astrophysicist says he may have an explanation for ring galaxies, the rarest types of galaxies found in the universe.
Ring galaxies are some of the rarest galaxies found throughout our universe, and for years scientists have scratched their heads, trying to figure out exactly how these galaxies came to be. According to astrophysicist Ethan Siegel, we may finally have an explanation for these unique and eye-catching galaxies.
Based on previous research into ring galaxies, Siegel says that they aren’t planetary nebulae because they are composed of stars, not of gas and other ejecta. Further, they aren’t made from younger galaxies being stretched and ripped apart to surround an older, more massive galaxy. Another look at the Cartwheel Galaxy shows the space between the main core and the outer ring. Image source: NASA, ESA, CSA, STScI, Webb ERO Production Team
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