Planetesimal formation.
Astronomers.
Astronomers
There were nine planets. Then astronomers got together and decided what to do with Eris, a dwarf planet that was discovered. They decided to make a definition for what is a planet. That led to Pluto being demoted to a dwarf planet.
Planets not orbiting a star but instead orbiting the galactic center are referred to as rogue planets, or nomadic or interstellar planets.
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Pieces of rock clumped together to make big ones
Here is one lie about how planets are formed: One day Zeus took a big doodoo. All his doodoo was floating in space and they clumped together to form the planets.
gravity clumped stars together, created planets and stopped everything from moving at the speed of light
Astronomers use a telescope to view planets directly.
Teams of astronomers have studies all possible planets.
Many astronomers, historians, regular people, and scientisis know about the planets in our Solar system.
astronomers
On one of the explorer's planets
Astronomers.
Astronomers (and their ilk) study stars and planets.
Astronomers
There were nine planets. Then astronomers got together and decided what to do with Eris, a dwarf planet that was discovered. They decided to make a definition for what is a planet. That led to Pluto being demoted to a dwarf planet.