The concept involves an asteroid counterweight and would be tremendously expensive to pull off.
. Such proposals aim to reduce global warming by shrinking the amount of solar radiation that reaches Earth’s surface—by, say, injecting large amounts of sulfur dioxide or dust into the air to mimic the cooling effect of large volcanic eruptions. Or building catapults to launch lunar dust into orbit around Earth and intercept the sun’s rays in the space near our planet.
, the L1 point’s counterpart 932,000 miles away from Earth in the direction of the outer solar system. Szapudi is not the first to suggest placing a sun shade at L1, but previous proposals ran into problems. Namely, a large sun shade will also act like a solar sail, catching solar radiation that will push the structure out of position at L1.
Astronomers would have to identify a suitable near-Earth asteroid for the counterweight through something like the University of Hawaii’s Panoramic Survey Telescope and Rapid Response System , Szapudi says. But once they did, the sun shade could be tethered to the asteroid in its existing orbit and used as a solar sail to divert the space rock toward the L1 point.
And if something went wrong with the sun shield, and it stopped blocking the sun suddenly, Earth would warm back up much more rapidly than humans have ever experienced r.
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