_____ spectral type stars are hotter than _____ spectral type stars
a. A, K b. M, F
c. B, O d. L, G
a
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What are the most likely sources of the methane gas detected in the Martian atmosphere by the Mars Express orbiter and the Curiosity rover?
A) biological activity only B) biological or geological activity C) comet impacts only D) geological activity only
Some double-pane airplane windows darken when the inner pane is rotated. The panes are
A) thin films. B) Polaroid filters. C) optical fibers.
A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will
A) move in a straight line. B) follow a spiral path. C) follow a circular path. D) move along a parabolic path. E) immediately stop.
Hot Jupiters were a surprise to astronomers. What is the current explanation for their existence?
A) Jupiters actually can form close to the host star, since they do not require as much hydrogen compounds and ice as originally thought. B) The temperature of the hot Jupiters is highly uncertain, so they might not be as hot as the astronomers say. C) Jupiters are supposed to form far away from their host star, and then they migrate closer through gravitational interactions with the protoplanetary disk. D) Jupiters form as a companion to the host star, but fail to become actual stars themselves because they are not massive enough.