what if alien worlds existed write in about 100 words
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Answer:
First, they'd need to find Earth from afar, either by watching our sun wobble as the planet's gravity tugs against it, or by seeing the sun dim as Earth blocks a tiny fraction of sunlight during its orbit. Nine known alien worlds can see Earth transit across our sun, just as we've seen thousands of alien planets dim their host stars.
Once spotted, our planet would likely intrigue E.T. Our sun is relatively stable, not prone to disastrous flares that'd rip our atmosphere to shreds. What's more, we fall squarely within our sun's habitable zone, the area around a star where liquid water can persist on a planet's surface. (These are just some of the things that make life as we know it possible on Earth.)
Faraway scientists might then attempt to spot our atmosphere, to see whether life's thumb is on the chemical scales.
For the most part, scientists assume alien contact would happen through a signal purposely sent toward Earth. The "acid test" is to make sure the signal is verified by multiple observatories, said SETI Institute senior astronomer Seth Shostak. "It would take a while to verify, and then the people who like to think about these matters say you would have a press conference and announce this to the world," he said, but he added that wouldn't work unless everyone in the project were sworn to secrecy. In this era of news leaks, he said that situation is very unlikely to hold.
So, scientists try instead to stick to a protocol that includes informing the public. The 2010 IAA protocol is only two pages and covers facets such as searching for a signal, handling evidence and what to do in the case of a confirmed detection.
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