RT @Astroguyz: #OnThisDay 1978: Pluto’s large moon Charon was discovered by James Christy: en.wikipedia.org/wiki/Charon_(m… #PlutoFlyBy #PlutoTime
RT @Astroguyz: #OnThisDay 1978: Pluto’s large moon Charon was discovered by James Christy: en.wikipedia.org/wiki/Charon_(m… #PlutoFlyBy #PlutoTime