The idea:
Flying mirrors could save earth from a catastrophic asteroid collision, researchers have claimed.
Up to 5,000 mirrors would be used to focus a beam of sunlight on to the asteroid, melting the rock and altering its orbital path away from earth....
"With only 10 spacecraft flying in formation, each with a 20m mirror, we could deflect a similar size asteroid into a safe orbit in about six months.
"Our studies show that this technology is genuinely feasible.Um, for a big asteroid, controlling 5,000 mirrors on spacecraft is considered feasible? Just blow it up.
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