16:58
If the Universe is Expanding, Why Are Galaxies Merging?
20:06
Gökyüzünde ANİDEN KAYBOLAN YILDIZLARIN Sırrı Ne Olabilir?
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Witnessing the Death of a Star: Can Supernovas Kill Us?
26:35
The Past and Future of Telescopes: Why Build Big Telescopes?
14:25