YesWeHaveNoTomatoes t1_j8v7kyx wrote on February 17, 2023 at 4:27 AM

Reply to comment by EarthSolar in If someone were to hypothetically put a sun next to ours as a binary system, would this increase the length of the habitable zone radius of the system? by Country_Royal

My understanding is that the problem for Mars and Mercury was that they aren't massive enough to keep their cores hot, so as the cores cooled their planetary dynamos slowed and the magnetospheres dissipated.

EarthSolar t1_j8vxf6s wrote on February 17, 2023 at 9:32 AM

Mercury is known to have a magnetosphere (albeit a weak one). by the way.