This x-ray image was taken by the Chandra X-ray Observatory. Without knowing anything more about the object that is shown, what can you conclude from looking at this image?
A) Some parts of the object emit more x-rays than others.
B) The x-rays from this object come in a variety of different colors.
C) This object emits much more light in the form of x-rays than in the form of visible light.
D) Yellow regions emit the highest-energy x-rays and red regions emit the lowest-energy x-rays.
A) Some parts of the object emit more x-rays than others.
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Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature. C) Galaxy collisions destroy most of the stars in the galaxies involved. D) Irregular galaxies rarely have star formation taking place in them. E) Most galaxies appear to be approaching the Milky Way Galaxy.
Apart from its distance from its parent star, what is the next most important factor that determines a planet's habitability?
A) whether it has a large moon B) the size of the planet C) the chemical composition of its atmosphere D) the chemical composition of its surface
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The work you do on the crate is __________
Fill in the blank(s) with correct word
A source emits sound at a fixed constant frequency f.If the source moves away from you, the frequency you hear is
a. the same as f. b. higher than f. c. lower than f. d. unrelated to f.