Confirmation of alien life would answer one enormous question and immediately create dozens more. Humanity’s reaction would ...

For thousands of years, humanity has looked up at the stars asking the same question. Are we alone? Then one day, it finally ...

Dyson: Vacuum Cleaner or Alien Mega-Structure? When you hear “Dyson,” what pops into your head? A brand of vacuum cleaner? Or ...

Claims that aliens are already here are everywhere, but proving them is another matter. The strongest cases become more ...

When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of biology because they are often produced by living microbes. However, ...

"Natural astrophysical processes rarely generate extremely narrow spectral features while engineered transmitters often do," writes a team of astronomers including first author Zi ...

We’ve been wondering if we are all alone in the universe for thousands of years. It hasn’t been until recently that we began a determined search of the heavens to see if extraterrestrial life is ...

Astronomers searching for signs of extraterrestrial intelligence may have been missing alien signals in part of the radio spectrum that has not recently been explored. Most radio SETI (Search for ...