What If on MSN
What if scientists proved Planet X is real?
Over the past century, astronomers have speculated about the existence of a mysterious 9th planet lurking in the outer ...
Amazon S3 on MSN
See what would happen if a new planet formed in our solar system
The scientific wonderers at What If explore the violent birth of a newly formed planet suddenly emerging within our Solar ...
An exciting new study titled "Soot Planets instead of Water Worlds", by Jie Li and associates, published in August 2025, challenges prevailing assumptions about the nature of many low-density ...
Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...
A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is hidden in our solar... If Planet Nine is out there, this telescope might ...
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