A stunning Hubble Space Telescope image shows Jupiter and three of its Galilean moons (Europa, Callisto, and Io) in a rare triple-moon conjunction. The moons' different colors (white, dark brown, and yellowish) are clearly visible against Jupiter's banded clouds. Two smaller moons, Amalthea and Thebe, are also visible.
Astronomy Picture from 06/02/2015
Jupiter Triple-Moon Conjunction
Source: https://apod.nasa.gov/apod/ap150206.html
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