A website has been launched that aims to get the public involved in the search for extraterrestrial life.

Announced at the TED (Technology, Entertainment and Design) conference in Los Angeles, the site will stream radio frequencies that are transmitted from the Seti (Search for Extraterrestrial Intelligence) Allen Telescope Array.

Participants will be asked to search for signs of unusual activity.

It is hoped the human brain can find things the automated system might miss.

The website is the latest stage in a quest "to empower Earthlings everywhere to become active participants in the ultimate search for cosmic company".