It’s a common method we use to find other planets—and E.T. could use it too.
For nearly 60 years, scientists have been pointing radio receivers and telescopes into the sky, searching for a sign that we’re not alone in the universe.
Microlensing is a way of detecting extremely distant planets—as in, tens of thousands of light-years away. Astronomers peering through powerful telescopes look for stars that suddenly get a lot brighter. such as radio broadcasts, laser signals, or industrial pollutants. Assuming aliens exist—and to be clear, many astronomers assume theyNot good. The authors assumed that an alien astronomer would be on a planet orbiting a star somewhere in our corner of the Milky Way galaxy, gazing toward another star—our own or one farther away—at the moment Earth passes between that star and the astronomer. They also assumed the aliens would have roughly the same technology we have.
It’s possible that’s actually good news. There’s an assumption in SETI that meeting aliens is a good thing. That our civilization, and theirs, can only benefit from an introduction—but what if that assumption is wrong? What if E.T. turns out to be hostile? “It is not necessarily a good thing to encounter aliens,” Annie Robin, an astrophysics researcher at the Institut Utinam in France and co-author of the study, told The Daily Beast.
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