When Astronomers Do Radar Astronomy, They

Multiple Choice

When astronomers do radar astronomy, they

A) look for radar beams from civilizations on other planets
B) they bounce a radar beam off the surface of solid objects in our solar system
C) they send out radar waves that can eventually reach and measure other galaxies
D) they send information from one telescope to another on Earth using radar waves
E) they try to avoid getting speeding tickets on their way hope from the observatory