andrewducker + earth   64

Mass Extinction And The Structure Of The Milky Way
tl;dr - when we're inside a spiral arm (60% of the time) there are a lot more comets and gamma bursters nearby.
space  life  death  earth 
may 2017 by andrewducker
What A Beautiful Blue Planet!
Some fantastic satellite photography of the planet
astronomy  beauty  environment  photos  science  space  earth 
november 2006 by andrewducker

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