Dr. Bruce Bettsさんのイラストまとめ
@RandomSpaceFactFollow @RandomSpaceFactさんをフォローする
Random space facts, easy astronomy. Planetary science. Chief Scientist at Planetary Society. Children's book author. Alum @Caltech, @Stanford, @JesuitHighSac
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equinox
Happy #equinox: the Sun is directly "over" the equator, day and night are the same duration, and we begin a new season
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The 5 spacecraft (Pioneers 10&11, @NASAVoyager 1&2, @NewHorizons2015) leaving the solar system:
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