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Most probably not, people have been observing and collecting data on our solar system for quite some time now, and so far no other planet has been seen directly. Even if not seen, a massive object could have gravitational effects on nearby objects which could be measured that would indicate their presence.
Planets are being discovered in other solar systems though.
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∙ 11y ago
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In what solar system do the planets travel around the sun?
In any solar system; that's what planets do.
What planet has more moons than any other planets in our solar system?
Saturn
Does the planets have any moons?
Yes. In the Solar System, all planets except Mercury and Venus have one or more moons.
Does any of the planets have moons?
Yes. In the Solar System, all planets except Mercury and Venus have one or more moons.
Can astronauts travel to distant planets in the solar system?
They could, but as of now, no astronauts have travelled to any other planets in the solar system.
What solar system body was a planet but officially isn't any more?
Pluto and the dwarf planets
Are there any other planets outside of our solar system?
Yes more than you can ever imagine
Does the asteroid belt help or hurt the major planets of our solar system?
The Asteroid Belt has no effect on any of the major planets of our solar system.
Which planet has at least 62 moons more than any other planets in our solar system?
Jupiter
How many planets in your solar system do not have any moons?
Two of them
What planets in the solar system do not have any moons?
Mercury and Venus.
What planets has more moons than Jupiter?
Within our Solar System, no planet has more moons than Jupiter. [See related question] Outside of our Solar System, it is any ones guess.
