Recent Examples of inner planet from the Web
Two centuries later, astronomers attributed Mercury’s slightly peculiar orbit to the gravitational forces from an unseen inner planet, dubbed Vulcan.
A century ago, our solar system seemed split into two tidy groups: the terrestrial inner planets — Mercury, Venus, Earth, Mars — and the giant, gaseous outer worlds.
Among the inner planets, only Mars has known Trojans—10 of them, the biggest measuring about 2 kilometers across.
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