Which of the following best describes what we mean by gravitational lensing?
A) A massive object bends light beams that are passing nearby.
B) A massive object scatters away the light of more distant objects.
C) Gravity causes matter that would otherwise be dark to become visible.
D) Telescope lenses are distorted by gravity.
A) A massive object bends light beams that are passing nearby.
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"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars
State Einstein's principle of equivalence
What will be an ideal response?
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.
An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. The direction of the electric field vector of this wave is
A) horizontal and pointing south. B) vertical and pointing down. C) horizontal and pointing north. D) vertical and pointing up. E) horizontal and pointing east.