Neutron Stars – The Most Extreme Things that are not Black Holes
YouTube Source:
Dinge erklärt – Kurzgesagt 
Categories: Astronomy, Science
Erklärvideos
Throwback Thursday: How Big is the Moon? MM#1
(from my archive)
YouTube Source:
Dinge erklärt – Kurzgesagt
Categories: Astronomy, Science, Throwback Thursday
Erklärvideos
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