why earth are mysteries and how to aliens use our earth which alien firstly vist our earth??
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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. But what would they be looking for? And could they really infer life's presence across trillions of miles?