Any aliens orbiting these 2,000 stars could spot Earth crossing the sun
They would find the planet the way astronomers here detect exoplanets
![a row of stars in the night sky, with the milky way in the background](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/06/062221_lg_earth-from-space_feat.jpg?fit=1030%2C580&ssl=1)
Thousands of star systems (some shown in the horizontal line in this artist’s illustration) could see Earth’s shadow as the planet passes in front of the sun.
OpenSpace/American Museum of Natural History