2. Orbit a star. 3. The object has cleared the path in front of it. The planets in the Solar System are :-. Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto (ex-Planet) Pluto was downgraded as a result of the vote. It failed the third test. There are two main ...
But is Kepler 37-b really a planet? It certainly isn't like any of the planets in the solar system. In fact, the definition of a planet is tailored mostly to our solar system, Barclay said. According to the International Astronomical Union, a planet must orbit a star, be large enough...