Recent measurements of the variations of the cosmic background radiation suggest that the curvature of the Universe is ________.
A. negative
B. positive
C. flat (i.e., no curvature)
Answer: C
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Pure iron at room temperature has the BCC structure; however, iron can also be found in the FCC structure at higher temperatures. Predict the lattice parameter of FCC iron if it did form at room temperature, assuming that atoms touch only along the most closely packed directions in both the FCC and BCC structures. The lattice parameter of BCC iron at room temperature is 0.286 nm.
What will be an ideal response?
Which of the following is an example of a star?
A) Venus B) Pluto C) The Sun D) The Moon
If we are eventually able to detect Earth-like extrasolar planets directly, they will be seen very
A) close to their parent stars and will be very dim in comparison B) far from their parent stars and will be very dim in comparison C) far from their parent stars and will be bright in comparison D) close to their parent stars and will be bright in comparison
The belts and zones of Jupiter are
A) alternating bands of rising and falling air at different latitudes. B) cyclonic and anticyclonic storms. C) names for different cloud layers on Jupiter. D) alternating regions of charged particles in Jupiter's magnetic field. E) the thermosphere and stratosphere respectively.