内ない惑わく星せい

noun

inner planet

Astronomical term for planets whose orbits lie inside the asteroid belt: Mercury and Venus. Sometimes also includes Earth and Mars in broader usage.

• 内ない惑わく星せいは地ち球きゅうよりも太たい陽ように近ちかい軌き道どうを回まわっている。

  Inner planets orbit closer to the sun than Earth does.