Info

Extraterrestial Intelligence (SETI)

Microwave

10 to 0.01

10~5 to 10~2

Pulsars; dusty regions of galaxies

Infrared

0.01 to 7 x10~5

0.01 to 2

Cool stars; infrared galaxies; nebulae

Visible light

7 x 10~5 to 4 x10~5

2 to 3

Planets; moons; galaxies

Ultraviolet

4 x 10~5 to 10-7

3 to 103

Young, hot stars; galaxy evolution

X-ray

10-1 to 10-9

103 to 105

Black holes; hot gases

Gamma ray3

<10-9

>105

Supernovae; solar flares

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