526,777 views
15 votes
15 votes
Why do astronomers believe there is a 9th planet

User Peter Rakmanyi
by
3.0k points

1 Answer

10 votes
10 votes

Answer:

There are gravitational effects causing a cluster of orbits for a group of ETNOs, this is high evidence there is a 9th planet past Neptune.

User Ketan P
by
3.1k points