And the 2006 decimation of planet that made Pluto not a planet explicitly added “must not orbit another object” to stop the moon from being a planet.
Comment on Pluto is still a planet, just a dwarf one
frog@feddit.uk 3 weeks agoThe Earth’s Moon is about 1.5 times bigger than Pluto.
bob_lemon@feddit.org 2 weeks ago
ParlimentOfDoom@piefed.zip 2 weeks ago
And Titan is 6% bigger than Mercury.
mrsemi@lemmy.world 3 weeks ago
in Asimov’s Foundation series, there is (was) a galaxy-spanning human civilization, but Earth was lost and mostly considered mythical. One of the arguments against it actually existing was the absurdity of such a double planet system existing. In the wider galaxy only giant planets had such large satellites.
a_non_monotonic_function@lemmy.world 3 weeks ago
In his books were they similarly absurdly tiny, rotating in irregular orbits well outside of their class of planets, and inhabiting an entire solar system of similarly sized unremarkable objects?
captainlezbian@lemmy.world 2 weeks ago
The earth’s moon is an extreme outlier to our knowledge. Thea made our world weird
frog@feddit.uk 2 weeks ago
Is it an outlier because the moon is a pretty big satellite for such a snall planet?