Wobbling exoplanet hints at a hidden exomoon so massive it could redefine the word 'moon' altogether
"In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring here." ...
The Ring Nebula, also known as Messier 57, sits about 2,000 light-years from Earth. It is a planetary nebula—a misleading ...
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