We’ve discovered what appears to be the first known moon outside of the solar system and new models of Europa’s surface predict the presence of ice blades!
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Sources:
https://www.spacetelescope.org/news/heic1817/
http://advances.sciencemag.org/content/4/10/eaav1784
https://news.columbia.edu/exomoon
http://hubblesite.org/news_release/news/2018-45
https://arxiv.org/abs/1707.08563
https://press.nature.com/wp-content/uploads/files/2018/10/41561_2018_235_OnlinePDF.pdf
https://www.jpl.nasa.gov/missions/europa-clipper/
https://www.nasa.gov/feature/scientists-offer-sharper-insight-into-pluto-s-bladed-terrain
https://physics.aps.org/story/v17/st7
Images:
https://www.spacetelescope.org/images/heic1817a/
https://commons.wikimedia.org/wiki/File:Neptune,_Earth_size_comparison.jpg
https://www.spacetelescope.org/videos/heic1817a/
https://www.spacetelescope.org/videos/heic1817b/
https://commons.wikimedia.org/wiki/File:Jupiter_Earth_Comparison.png
https://commons.wikimedia.org/wiki/File:Planetary_Analogue.jpg
https://commons.wikimedia.org/wiki/File:Penitentes_Agua_Negra.JPG
https://commons.wikimedia.org/wiki/File:Snow_penitentes_Mount_Rainier.JPG
https://commons.wikimedia.org/wiki/File:PIA19048_realistic_color_Europa_mosaic.jpg
https://commons.wikimedia.org/wiki/File:Penitentes_Upper_Rio_Blanco_Argentine.jpg
https://commons.wikimedia.org/wiki/File:PIA21048_-_Europa_Lander_Mission_Concept_(Artist%27s_Rendering),_Figure_1.jpg
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