Its true that something very strange is going on in our universe. Not only do stars move too quickly within galaxies, but, structures are growing and evolving far too rapidly for our calculations: meaning that Dark Matter may be lighter or heavier than we predicted.
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The mysterious matter that makes up most of the mass in the entire universe has traditionally been thought of as the cause of the above issues, but there simply isn’t enough gravity to explain these situations.
Read more about this at Space.com
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