LONDON: Hubble Space Telescope has captured three of Jupiter’s moons marching across the huge planet’s disc, a stunning sight that happens only once or twice every 10 years.
The rare triple-moon conjunction on Jupiter, which Hubble witnessed on Jan. 24, involved Io, Callisto and Europa — three of the gas giant’s four Galilean moons (so named because they were discovered by astronomer Galileo Galilei in the early 17th century).
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“The moons in these photos have distinctive colors. The ancient, cratered surface of Callisto is brownish; the smooth icy surface of Europa is yellow-white; and the volcanic, sulfur-dioxide surface of Io is orange,” representatives of the Space Telescope Science Institute (STScI) in Baltimore, which operates Hubble.
