The MMX probe will go to Mars’s moons
JAXA
The thriller of how Mars acquired its moons, Phobos and Deimos, could begin to be unravelled in 2026 with the launch of a spacecraft that can finally deliver a piece of Phobos again to Earth.
“We’re certain concerning the origin of the Earth’s moon, however we don’t know the way Phobos and Deimos received there,” says Emelia Branagan-Harris on the Pure Historical past Museum in London. “Understanding the origins of Phobos and Deimos, and the way they got here to be orbiting Mars, can hopefully inform us a bit concerning the evolution of Mars on the whole and its historical past.”
There are two competing hypotheses for a way these moons got here to orbit Mars: the Crimson Planet might have captured them as a pair of asteroids, which have been both conjoined and later separated or intently orbited one another, or they may have been produced from an asteroid smashing into Mars itself, like how Earth’s moon fashioned.
Up to now, now we have restricted proof for both state of affairs, however the Japan Aerospace Exploration Company’s Martian Moons eXploration (MMX) spacecraft, which is able to launch someday after April 2026, ought to be capable of definitively rule out one state of affairs or the opposite, says Branagan-Harris. The spacecraft is provided with a raft of cameras and spectrometers it may possibly use whereas orbiting the moons, which it’s scheduled to achieve in 2027, in addition to a rover that it’ll deploy to the floor of Phobos to gather samples.
If the observations discover plentiful carbon-rich molecules and water, this might recommend that the asteroid seize principle is right. But when they’re absent, then we would want to attend the samples return to Earth for evaluation, which is at the moment scheduled for 2031.
These samples will encompass rock each from Phobos’s floor and from a number of centimetres into the bottom. As soon as we are able to take a look at the fabric itself, we are able to see whether or not it exhibits indicators of melting previously and infer whether or not it got here from a collision with the Martian floor.
No matter Phobos’s origin, it orbits shut sufficient to Mars that it would include well-preserved samples from the planet at an earlier time in its historical past. “There’s a possible there that Phobos might have items of historical Mars from again when it had liquid water, so we’d be studying loads concerning the historical past of Mars as effectively,” says Branagan-Harris.
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