Topic: SETI

The Five-hundred-meter Aperture Spherical Telescope (FAST) is nestled within a natural basin in China's remote and mountainous southwestern Guizhou province. (Getty Images/Jeff Dai/Stocktrek Images)

China's mysterious alien radio signal

Nicole Karlis
James Webb Space Telescope looking at galaxies (Photo illustration by NASA)

Finding ET through... pollutants?

Nicole Karlis
This is an artist's concept of a plume of water vapor thought to be ejected off the frigid, icy surface of the Jovian moon Europa, located about 500 million miles (800 million kilometers) from the sun. Spectroscopic measurements from NASA's Hubble Space Telescope led scientists to calculate that the plume rises to an altitude of 125 miles (201 kilometers) and then it probably rains frost back onto the moon's surface. Previous findings already pointed to a subsurface ocean under Europa's icy crust. (NASA/ESA/K. Retherford/SWRI)

Jupiter's moon Europa teems with water

Nicole Karlis
This undated handout photo provided by Seth Shostak, SETI Institute, shows the Arecibo radio telescope in Puerto Rico. (AP Photo/Seth Shostak, SETI Institute)

Astronomer explains how to see aliens

Jason Wright - The Conversation
This artist’s impression shows the first interstellar asteroid: 'Oumuamua. (ESO/M. Kornmesser)

Bizarre space rock is not alien-made

Nicole Karlis
Artist’s impression of `Oumuamua (ESO/M. Kornmesser)

Why 'Oumuamua sped up as it flew by

Camille M. Carlisle - Sky & Telescope
Arecibo Radio Telescope (Getty/TexPhoto)

Weird radio signal flummoxes astronomers

Nicole Karlis
This artist’s impression shows the first interstellar asteroid: 'Oumuamua. (ESO/M. Kornmesser)

Debate rages over 'Oumuamua's origins

Nicole Karlis
(Getty/dottedhippo)

Martian lakes and the chance for life

Nicole Karlis
Artist’s impression of `Oumuamua (ESO/M. Kornmesser)

Nothing yet in the search for alien life

Ray Norris - The Conversation
Artist’s impression of `Oumuamua (ESO/M. Kornmesser)

Is Oumuamua of alien origin?

Nicole Karlis
Arecibo Observatory (Getty/IsaacRuiz)

Why tech billionaires want to find E.T.

Keith A. Spencer
FILE-This Aug. 31, 2015, file photo shows the Gemini Telescope, right, and Canada-France-Hawaii Telescope on Hawaii’s Mauna Kea near Hilo, Hawaii. (AP Photo/Caleb Jones, File)

Are we alone?

Andrew Norton - The Conversation
(Ranglen/Shutterstock)

Lindsay Abrams