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Could meteor storms harm NASA's future moon missions?
"If a major meteor shower outburst or storm is forecast during a mission or crew activity, the mission would be delayed or the crew kept inside until the outburst or storm is over."
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Meteor showers are among the most beautiful phenomena to brighten Earth's sky, but could the fast moving space rocks that accompany major events threaten or delay future Artemis moon missions as NASA and its partners plan for a lunar landing attempt?
NASA estimates that approximately 48.5 tons (44,000 kilograms) of naturally occurring space debris falls into Earth's atmosphere each day. These fragments range in size from tiny micrometeoroids a fraction of a millimeter in diameter to larger particles that create spectacular shooting stars and fireballs as they burn up during atmospheric entry.
The space around Earth gets even more crowded during meteor showers, as Earth careens through one of the many debris streams continuously shed by asteroids and comets as they make lazy circuits around the sun.
Micrometeoroids travel through space at hypervelocity speeds averaging 22,000 miles per hour (34,405 kilometers per hour), according to NASA. At that pace, even a tiny micrometeoroid has the ability to impart a significant kinetic blow upon striking a spacecraft en route to the moon, with potentially disastrous results for the astronaut crew inside.
Fast moving debris has the potential to penetrate or deform a spacecraft's hull, damaging critical systems or even triggering a catastrophic rupture. There is also the risk that a micrometeoroid could punch a hole in one of the heat-resistant outer tiles on the Orion spacecraft, NASA's crew capsule for the agency's Artemis moon missions, undermining its ability to survive the intense furnace of reentry, per NASA.
The Chinese Space Agency was given a stark reminder of the dangers posed by space debris in November last year, when taikonaut Chen Dong discovered a crack in the viewport of his Shenzhou-20 spacecraft, which forced the three person crew to use a different return craft for their journey.
Thankfully, modern spacecraft such as the Orion capsule used for NASA's Artemis moon missions have been designed to mitigate the threat posed by micrometeoroid impacts, in so far as is possible. "Orion spacecraft material selection and thicknesses have been optimized for [micrometeoroid and orbital debris] (MMOD) protection and risk balancing," said Mike Heckwolf, Orion crew and mission risk integrator at Lockheed Martin's in an email to Space.com.
"Hypervelocity impact testing is conducted to confirm impact physics, to characterize damage survivability, and verify performance of the Orion spacecraft MMOD design," continued Heckwolf. "The Artemis mission trajectory and Orion flight attitude are carefully assessed to minimize MMOD risk."