Scientists have been searching and investigating beyond the Earth for centuries. However, right now the investigations also focus around which planets the Earth is visible from, and from which stars, that is… from where are the aliens observe us.
Most of the discoveries from the currently known planets were made thanks to telescopes and observatories that can identify interferences in the light that arrive from other galaxies. Through this same technique we can discern, approximately, from where extraterrestrial life could be observing us.
To make an estimate of which planets extraterrestrial civilizations could be observing us from, scientists turned to the cluster of stars called the Transiting Exoplanet Survey Satellite ( TESS for its acronym) and Gaia.
These confirmed that the Earth is observable from up to 326 light-years where there are 1 thousand 4 stars similar to the Sun. Of course, this alien life must have conditions similar to that which exist on Earth and technology comparable to ours.
The results of this research were published in Monthly Notices of the Royal Astronomical Society, which also explains that in that observable region of the universe, from which hypothetical extraterrestrials could actually be watching us, there are up to 100 planets that have conditions conducive to harboring life.
“If observers were out there searching, they would be able to see signs of a biosphere in the atmosphere of our Pale Blue Dot. And we can even see some of the brightest of these stars in our night sky without binoculars or telescopes.”
Obviously, if they can see us, we can see them, however, what we would see, would be a very different time frame and not the current one, but one that could also give a great rationale to the evolutionary processes.
