There are always incomplete knowledge in our lives. Often, our beliefs are based on the old theory that may not be accurate. Even our solar system which has been long understanding that it composed of 9 planets changed 5 years ago after pluto was demoted from its planet.
It has been found out some time this year that this belief is not accurate and that there is a new planet named Tyche. Therefore, it is possible that our solar system may (again) has 9 planets. This is still however not proven and we shouldn't be certain that this theory is accurate. As some time in the future, we might develope a more powerful telescope and find new information about our solar system, and yet it might be possible that we are not alone in this solar system.
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