Stars Insider on MSN
Is there a mysterious ninth planet in our solar system?
New evidence shows that, far beyond Pluto, there may exist a hypothetical planet referred to as Planet X or Planet Nine.
The Why Files on MSN
How Mars may have been a moon before its parent planet was destroyed
Planetary scientist Tom Van Flandern argued that the solar system did not form the way it was taught in schools. He believed ...
TRAPPIST-1e, an Earth-sized world in the system’s habitable zone, is drawing scientific attention as researchers hunt for ...
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