NASA Has a Plan to Keep Space Dust From Hitting Webb Telescope’s Mirror
Space isn’t empty. The next-gen James Webb Space Telescope has to sweat the small stuff: dust-sized particles that can impact their shiny golden mirrors. On Tuesday NASA shared a new plan aimed at protecting Webb from damage by these micrometeoroids.
Webb’s designers knew the telescope was going to get hit, so the observatory was engineered to hold up under strikes. However, the telescope got smacked in May by an “unavoidable” micrometeoroid that was larger than expected. Webb is still operating just fine despite the injury, but the dust strike prompted NASA to think through ways to mitigate future damage.
“We have experienced 14 measurable micrometeoroid hits on our primary mirror, and are averaging one to two per month, as anticipated,” Webb lead mission systems engineer Mike Menzel said in a statement. “The resulting optical errors from all but one of these were well within what we had budgeted and expected when building the observatory.”
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NASA pulled together a group of optics and micrometeoroid experts to analyze the concerning impact. The group decided it was “a rare statistical event.” So basically JWST was unlucky. To reduce the danger from similar hits in the future, Webb will aim to face away from areas designated as “micrometeoroid avoidance zones.”
The zones are areas where micrometeoroids would be more likely to strike the telescope’s mirrors head on at a high velocity. “This does not mean that these areas of the