by rovers
Planets not orbiting a star but instead orbiting the galactic center are referred to as rogue planets, or nomadic or interstellar planets.
In our solar system, Mercury and Venus are the two planets which do not have moons.
Ancient India discovered only 5 planets without a telescope, because they could see the planets with their eyes, just as we can. Those planets are:MercuryVenusMarsJupiterSaturn
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Without the planets orbiting the sun all the planets would be cold and dark
Since the 2006 reclassification of Pluto to a Dwarf Planet, there are now eight planets in our solar system.
without a nebula, no pulsar
make a new hypothesis. if not the scientist continues believing in their hypothesis without any proof and becomes a mad scientist
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taking blood samples from patients for research purpose without consent
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'Mercury' and 'Venus' is. Those are the only planets in our solar system without moons.