181. Fun with photons.
Fun facts about the things that make astronomy work.
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Astronomy Without A Telescope
the e-book is now available:
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Category Physics and astrophysics
173. Habitable zones
Cheap Astronomy keeps you in the zone.
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170. Some observations on speed and energy
Cheap Astronomy’s calorie control plan
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156. How to colonize the galaxy
Broadcasting humanity.
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153. Panspermia or not
Occams razor says not
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