Because our eyes cant pick up things such as heat spots and cold spots and infrared.
Spitzer
a)10 x 8 degrees (about the area of your fist held out at arm's length).wavelengths of 3 and 180 microns (1 micron is one-millionth of a meter).
c)6,500 lightyears away
d)The spitzer telescope is a reflector using a Beryllium metal mirror.
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