radio astronomy 
noun [mass noun]
The branch of astronomy concerned with radio emissions from celestial objects.As a next step the astrophysicists want to use the upcoming LOFAR array in the Netherlands and Germany for radio astronomy and cosmic ray research....
- Allen said that the project was an opportunity to search for intelligent life beyond the solar system while doing conventional radio astronomy.
- Today some 10 neutron-star-neutron-star binaries have been discovered, and radio astronomy has accumulated a spectacular database of more than 1500 pulsars.