Image
Radio telescope

Part of spectrum viewed:
Location:
Sources of radiation:
Many radio waves in space come from cold clouds of hydrogen gas.
Most stars do not give off many radio waves.
Image: A composite image of the Whirlpool Galaxy, using radio and visible light wavelengths. The white is how the galaxies appear to optical telescopes – one giant spiral galaxy with a smaller one hanging off an arm. The Very Large Array radio telescope array sees a much bigger picture. © B. Saxton (NRAO/AUI/NSF) with data provided by J. Hibbard, CC BY 3.0.