Aliens May Have Already Know We Are Here on Earth

  Scientists have been scanning the cosmos for possible signals from alien civilizations for decades, but for over a century, humans have also been sending out signals from Earth that could be picked up by aliens beyond our planet. That is, if they're looking in the right place for us. New research has determined exactly which star systems have been -- or will be -- in a position to spot Earth and mark it as a potential home to intelligent life worth investigating further (or perhaps avoiding altogether).

Any civilization with our level of technology could have seen Earth already claimed astronomers.

Us team of scientists used data from the European Space Agency's Gaia space observatory to identify 2,034 nearby systems with promising perches for scoping out some human aliens.

We wanted to know which stars have the right vantage point to see Earth, as it blocks the sun's light. And because stars move in our dynamic cosmos, this vantage point is gained and lost."   So the scientists tapped the latest, extensive Gaia star catalog, which contains both the positions and motion of stars, to find answers.   They found that 1,715 of the star systems have been in the right position to have spotted Earth passing in front of, or transiting, the sun since human civilization got going about 5,000 years ago. The other 319 systems will move into a position with a line of sight to Earth over the next 5,000 years.  

In a paper published online Wednesday in the journal Nature, the scientists further zoom in on 75 systems that have been in that ideal human-spotting range, called the Earth Transit Zone, since commercial radio stations began sending broadcast signals into space that travel outwards into the cosmos at the speed of light.

So if someone or...

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