Curiosity captures footage a Martian moon eclipse

Deimos, the smaller of the Mars moons, gets overshadowed by its sibling Phobos. The large recess at the bottom of Phobos is Stickney Crater.

As Curiosity continues to trek across the wild red yonder of Mars, it stopped for a moment earlier this month to observe the two Martian moons, Phobos and Deimos, passing by each other in the night sky. This imagery of one Martian moon eclipsing another as seen from the surface of Mars is the first of its kind, and serves a useful purpose for astronomers.

“The ultimate goal is to improve orbit knowledge enough that we can improve the measurement of the tides Phobos raises on the Martian solid surface, giving knowledge of the Martian interior,” said Mark Lemmon, a Texas A&M University co-investigator working with Curiosity’s Mastcam. “We may also get data good enough to detect density variations within Phobos and to determine if Deimos’ orbit is systematically changing.”

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