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A Complete Introduction to Stargazing (Free Chapters) — check our channel profile for the link Watch our full video here (tap & hold the link below, drag to highlight it, then select 'Open link'): https://youtube.com/watch?v=LDXc14q9hw4 In 1971, astronomers found Cygnus X-1 — an invisible object pulling matter from a companion star, heating ...
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