Do only gas planets have discs or even rocky planets may have them orbiting around? If rocky planets are great in volume is then a higher chance for an orbiting disc to exist in the planetary orbit?

  • $\begingroup$ Are you asking about ring systems? $\endgroup$
    – PM 2Ring
    Commented Jul 14, 2023 at 2:38
  • $\begingroup$ Even a rocky planet is bigger than you need. At least one dwarf planet has multiple rings. The moon Iapetus may have had one. $\endgroup$
    – J.G.
    Commented Jul 14, 2023 at 15:20

1 Answer 1


There is no known reason why a rocky (or terrestrial) planet cannot have a ring system, although their smaller size and lower gravity makes this less likely for a terrestrial planet than for a gas giant. According to the Wikipedia article on ring systems:

It is also predicted that Phobos, a moon of Mars, will break up and form into a planetary ring in about 50 million years. Its low orbit, with an orbital period that is shorter than a Martian day, is decaying due to tidal deceleration.


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