A comet from another star system does not arrive every year. That is part of what made 3I/ATLAS so compelling when it ...
Astronomers swept millions of candidates and found no alien signals from K2-18b, setting the first power limit on any ...
The first unmistakable signal from another intelligence may not be a cheerful greeting. A growing group of researchers is arguing that our inaugural contact is more likely to be a distress call, the ...
Solar winds and coronal mass ejections may scatter narrow signals, making them harder for Earth-based telescopes to detect. The SETI Institute uses radio telescopes to search for signs of intelligent ...