The detectors on the Spitzer Space Telescope were cooled to near absolute zero in order to:
A) allow the electronics in these instruments to operate most efficiently.
B) keep the telescope more nearly stationary.
C) prevent the infrared radiation from the instruments interfering with the infrared signals from space.
D) improve the angular resolution of the telescope.
Question 2
A(n) ________ spiral galaxy has a very bright active nucleus with violent motions in the interstellar gas.
Fill in the blank(s) with correct word
