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Cool Multiwavelength Fact

Multiwavelength Astronomy

Objects at Different Wavelengths

Type of RadiationWavelength (nm)Temperature (K)Typical Sources
gamma-rays <0.01 >108 no sources; some gamma-rays produced in nuclear reactions
X-rays 0.01-20 106-108 gas in clusters of galaxies; supernova remnants; solar corona
UV 20-400 104-106 supernova remnants; very hot stars
Visible 400-700 103-104 stars
Infrared 103-106 10-103 cool clouds of dust and gas; planets; satellites
Radio >106 <10 no objects this cold; emission produced by electrons moving in magnetic fields


A service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/GSFC

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