Do you think that some time in the future it will be known that there is other planets other than us and the 7 main

Question: Do you think that some time in the future it will be known that there is other planets other than us and the 7 main ones? And what do you think it would most likely to be made of?
- Keywords:
  discover,
  future,
  planet
Asked by anon-226236 to joannabarstow on 21 Nov 2019.
- Joanna Barstow answered on 21 Nov 2019:
  
  We already know – we have found over 4,000 planets orbiting other stars.
  
  There is also speculation that there might be another planet hiding at the outer edges of our own Solar System (Planet Nine) but we don’t have any substantial evidence for this yet.

anon-226236 commented on 21 Nov 2019:

How many other galaxies do you think there is outside of our Solar System?

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Question: Do you think that some time in the future it will be known that there is other planets other than us and the 7 main ones? And what do you think it would most likely to be made of?