This pollution doesn't pose a threat to Earth. If anything, it's a gift to scientists: Astronomers will fire powerful lasers into the gassy debris, creating artificial stars that help researchers snap clearer photos of the cosmos.
"One of the gases left behind by meteors is sodium, which collects in a layer about 60 miles (90 kilometers) above the Earth," Chad Trujillo, head of the Gemini Observatory's adaptive optics program, said in a statement. []
"The reason astronomers are so fond of this particular pollution layer is because we can make it glow by using a sodium laser to excite this sodium and produce temporary, artificial stars wherever we like," Trujillo added. "Believe it or not, there aren't enough stars in the sky for astronomers!"
Through adaptive optics systems, scientists can cancel out the hazy interference of Earth's atmosphere during telescope observations from the ground; this allows them to see the universe with remarkable clarity. Artificial stars, also called , can help astronomers correct these adaptive optics systems. They analyze light from guide stars to create a baseline to determine the blurring effects of the atmosphere.
"Perhaps one person's celestial 'pollution' is another's 'natural resource,'" Maria Womack, an astronomy program officer at the U.S. National Science Foundation, said in a statement. "It's this sodium layer, provided courtesy of meteors like the Perseids, that astronomers use to get the clearest views and understand the universe better."
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