Scientists search for extra terrestrial intelligence (SETI)

Radio Signals

SETI looks for radio wavelength signals being sent to Earth

These signals can only be sent by a transmitter

SETI has been running for 40 years…

not found anything

Now searching for laser signals too!

Robots Collect Photos and Samples

Spacecraft are sent to planets to look for microorganisms

Collect samples and take photos

Scientists analyse samples and look for fossils etc.