Astronomers took advantage of a lunar eclipse to study Earth as if it were an exoplanet, and Mars’s Insight lander used seismic data to reveal for the first time boundaries between different layers of Mars.
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Sources:
https://iopscience.iop.org/article/10.3847/1538-3881/aba0b4/pdf
https://www.spacetelescope.org/news/heic2013/
https://www.nasa.gov/feature/goddard/2020/hubble-uses-earth-as-a-proxy-for-identifying-oxygen-on-potentially-habitable-planets-around
https://exoplanetarchive.ipac.caltech.edu/
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020GL089630
https://www.eurekalert.org/pub_releases/2020-08/ru-rru080520.php
Images:
https://svs.gsfc.nasa.gov/12313
https://svs.gsfc.nasa.gov/13680
https://svs.gsfc.nasa.gov/11413
https://svs.gsfc.nasa.gov/20319
https://mars.nasa.gov/resources/4497/mars-interior/?site=insight
https://svs.gsfc.nasa.gov/31002
https://www.nasa.gov/image-feature/jpl/pia22232/insight-s-landing-site-elysium-planitia
https://svs.gsfc.nasa.gov/20201
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