Three-headed Cerberus is Hydra's sibling. "Cerberus: How could you go wrong with a name like that?" Showalter said. "But, unfortunately, Cerberus is already the name of an asteroid. The IAU balks at ...
In these two images from the Hubble Space Telescope, Pluto's new moon, P4, can be seen to move around the dwarf planet. NASA, ESA, and M. Showalter (SETI Institute) Pluto has a fourth moon, scientists ...
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