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Are there any other planets in the solar system other than the 9 we are familiar with?
Question Date: 1998-03-12
Answer 1:

It is very unlikely. If there were another planet, it should have been seen by now, either with optical telescopes or (for a distant, dark planet) infrared detectors on satellites. In addition, the gravity from another planet in our solar system would slightly alter the orbits of other planets, and we would probably notice that.

Answer 2:

There might be other planets that no one has found yet.How do you think people find planets or comets or asteroids?

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