Can E.T. see us? Astronomers find many stars with prime view of Earth

A line of spots across the center of an illustration of space indicates star systems that can see Earth.
The line of spots across the center of this illustration indicates star systems that can see Earth, center, as it moves in front of our Sun, left.
(OpenSpace/American Museum of Natural History via Associated Press)

Ever feel like you are being watched? It could be from a lot farther away than you think.

Astronomers took a technique used to look for life on other planets and flipped it around — so instead of looking to see what’s out there, they tried to see what places could see us.

Turns out, there’s a lot.

Astronomers calculated that 1,715 stars in our galactic neighborhood — and hundreds of probable Earth-like planets circling those stars — have had an unobstructed view of Earth during human civilization, according to a study published Wednesday in the journal Nature.

“When I look up at the sky, it looks a little bit friendlier because it’s like, maybe somebody is waving,” said study lead author Lisa Kaltenegger, director of the Carl Sagan Institute at Cornell University.


Even though some experts, including the late Stephen Hawking, warn against reaching out to aliens because they could harm us, Kaltenegger said that ship has sailed. If the planets with a view of Earth have advanced life, someone out there could conclude that there is life here based on the oxygen in our atmosphere, or by the radio waves from human sources that have swept over 75 of the closest stars on her list.

“Hiding is not really an option,” she said.

One way humans look for potentially habitable planets is by watching them as they cross in front of the star they are orbiting, which dims the star‘s light slightly. Kaltenegger and astrophysicist Jacqueline Faherty of the American Museum of Natural History used the European Space Agency’s Gaia space telescope to turn that around, looking to see what star systems could watch Earth as it passes in front of the sun.

They looked at the 331,312 stars within 326 light-years of Earth. (One light-year is 5.9 trillion miles.) The angle to see Earth pass in front of the sun is so small that only the 1,715 stars could see Earth at some point in the last 5,000 years, including 313 that no longer can see us because we’ve moved out of view.

An additional 319 stars will be able to see Earth in the next 5,000 years, including a few star systems where scientists have already spotted Earth-like planets, which are prime candidates for contact. That brings the total to more than 2,000 star systems with an Earth view.

The closest star on Kaltenegger’s list is the red dwarf star Wolf 359, which is 7.9 light-years away. It’s been able to see us since the disco era of the mid-1970s.

Carnegie Institution for Science planetary scientist Alan Boss, who wasn’t part of the study, called it “provocative.” He said in addition to viewing Earth moving in front of the star, space telescopes nearby could spot us even if the cosmic geometry is wrong: “So intelligent civilizations who build space telescopes could be studying us right now.”


If so, why haven’t we heard from them?

It takes a long time for messages and life to travel between stars and civilizations might not last long. So between those two it’s enough to limit the chances for civilizations to exchange “emails and TikTok videos,” Boss said in an email. “So we should not expect aliens to show up anytime soon.”

Or, Kaltenneger said, life in the cosmos could just be rare.

What’s exciting about the study is that it tells scientists “where to point our instruments,” said SETI Institute astronomer Seth Shostak, who wasn’t involved in the new research. “You might know where to look for the aliens!”