The main photo and the smaller inset (at the lower left) both show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the infrared photo, and how do you know?
A) The main (larger) photo is the infrared because molecular clouds emit much more infrared light than visible light.
B) The main (larger) photo is the infrared one because star-forming clouds generally are pink in color.
C) The smaller inset photo is the infrared one because the cloud appears dark and infrared light is invisible.
D) The smaller inset photo is the infrared because edge of the cloud glows red in the image.
A) The main (larger) photo is the infrared because molecular clouds emit much more infrared light than visible light.
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Which of the following is the centerpiece in the unified model of active galactic nuclei (AGN) and quasars?
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Shawn is traveling away from you at a speed of 120 km/hr. He throws a baseball that, according to him, is going at 100 km/hr in your direction. What do you see the ball doing?
A) You see the ball traveling away from you at 120 km/hr. B) You see the ball traveling away from you at 100 km/hr. C) You see the ball traveling away from you at 220 km/hr. D) You see the ball traveling toward you at 20 km/hr. E) You see the ball traveling away from you at 20 km/hr.