Dolphins, aliens, and the search for intelligent life

How do we define intelligence? SETI, the Search for Extraterrestrial Intelligence, clearly equates intelligence with technology (or, more precisely, the building of radio or laser beacons). Some, such as the science fiction ...

Are all alien encounters bad?

The pages of ecological history are filled with woeful tales of destruction from non-native species -- organisms that originated elsewhere.

An atlas of the Milky Way

Sino-German research group draws a new map at the Urumqi radio telescope and discovers two supernova remnants.

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