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Dr. Becky talks about dark matter and black holes... One interesting bit of information I learned is that 85% of star systems in our galaxy have two or more stars, so a system like ours with only one star is actually in the minority.

#stars #video
Omnedon 7 July 15
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There used to be an aester theory that dark matter was a complete vacuum which would be an absence of everything, lack of matter. She explains what that's wrong. Great video, I subscribed.

barjoe Level 9 July 16, 2020
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[universetoday.com]

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