2.1红外窗口 波段范围在0.7~1000微米之间 波长区间 波长范围（μm) 温度范围Kelvin) WHAT WE SEE Cooler red stars Near- (0.7-1)to5 740t0(3,000-5,200) Infrared Red giants Dust is transparent Mid- Planets,comets and asteroids 5t0(25-40) 92.5-140)to740 Infrared Dust warmed by starlight Protoplanetary disks Emission from cold dust Far- (25-40)t0(200- (10.6-18.5)t0(92.5- Infrared 350) 140) Central regions of galaxies Very cold molecular clouds Near-Infrared:0.7 to 2.5 um visible and infrared NASA/IPAC 93.4 Mid-Infrared:3 to 25 um 90 85 Far-Infrared:above 25 um. 75 73.62.1 /034 6@ABC0.7 ~ 1000DEFG visible and infrared 'I1a 'Icd(µm) ./cd(Kelvin) WHAT WE SEE Near￾Infrared (0.7-1) to 5 740 to (3,000-5,200) Cooler red stars Red giants Dust is transparent Mid￾Infrared 5 to (25-40) (92.5-140) to 740 Planets, comets and asteroids Dust warmed by starlight Protoplanetary disks Far￾Infrared (25-40) to (200- 350) (10.6-18.5) to (92.5- 140) Emission from cold dust Central regions of galaxies Very cold molecular clouds Near-Infrared: 0.7 to 2.5 μm Mid-Infrared: 3 to 25 μm Far-Infrared:above 25 μm