3 ms·

Wouldn't it's composition be of more ice and rock (like pluto), therefore lower density than the moon?

• sapiogram 1y ago
  That's a reasonable assumption, but given Sedna's unusual orbit, its origin could also be quite different from Pluto's.
  • benbayard 1y ago
    In the wikipedia post you are replying to has the chemical composition of the surface of the planet, obviously we can't know what is beneath that, but to me, indicates this is closer to Pluto than it is to our Moon. > Detailed spectroscopic analysis has revealed Sedna's surface to be a mixture of the solid ices of water (H2O),[15] carbon dioxide (CO2), and ethane (C2H6), along with occasional sedimentary deposits of methane (CH4)-derived,[16] vividly reddish-colored organic tholins,[15] a surface chemical makeup somewhat similar to those of other trans-Neptunian objects.[17]