At which wavelength range is there no current or planned space observatory?
A) radio
B) infrared
C) visible
D) X-ray
E) gamma-ray
A
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______________is an alloy of copper and tin.
Fill in the blank(s) with the appropriate word(s).
Velocity Addition: A star is moving toward Earth at 90% the speed of light. The star emits light, which moves away from the star at the speed of light. What do Earth-based astronomers measure for the speed of this light?
A. c B. 1.9c C. 1.2c D. 0.98c E. 0.95c
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. B) The light that they emit is so weak that it is undetectable to our telescopes. C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. D) They interact with other matter only through the weak force and not through gravity or any other force.
A white dwarf has the mass of the Sun and the volume of
A) Jupiter. B) Earth. C) the Moon. D) Eros. E) Mars.