Space exploration: Is there anyone else out there?

Did You Know: Space – Is there anyone else out there?

So far we have only found life on Earth, but the universe could be full of life we haven’t yet discovered.

An organization called SETI (Search for Extra-Terrestrial Intelligence) is trying to find out if there is anyone else out there.

Allen Telescope Array

This collection of radio telescopes is called an “array.” It is used by SETI to hunt for signals, which may come from life elsewhere in the universe.

Scanning the sky

Scientists use a group of radio telescopes to scan the sky for radio signals that might be coming from space.

Radio receiver

The radio receivers are the telescopes’ “ears.” They are used to receive radio waves that are coming from space.

What messages have we sent out to space?

Arecibo message

Beamed to a group of thousands of stars, this message was the most powerful broadcast ever deliberately sent into space.

It contains details of life on Earth and a stick figure drawing of a human being.

Golden record

The Voyager 1 and 2 spacecraft have onboard records that explain where they came from. These include images and sounds from life on Earth.