If astronomers discovered a new inner planet in the solar system, it would most likely have the characteristic of fast revolution. Inner planets (also known as terrestrial planets) such as Mercury, Venus, Earth, and Mars are generally smaller and primarily rocky with solid surfaces. They also tend to have shorter orbital periods compared to outer planets due to their proximity to the Sun.
In contrast, large size and gaseous composition are more characteristic of the outer planets (Jupiter, Saturn, Uranus, and Neptune), and many moons are typically more common among those outer planets as well. Thus, a new inner planet would be expected to have a fast revolution around the Sun.
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