Which characteristic of Venus is NOT due to the runaway greenhouse effect?
A. thick lava that creates pillow-shaped domes
B. clouds that completely hide the surface
C. a very slow rotation rate
D. surface temperatures that are higher than Mercury's
Answer: C
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Kinetic energy of a rolling object
A. Is zero B. Is the same as a non-rotating object with the same speed C. Is greater than that of a non-rotating object with the same speed D. Is less than that of a non-rotating object with the same speed
Why would anyone be interested in mining material from an asteroid?
What will be an ideal response?
Which of the following methods has been the MOST successful in detecting extrasolar planets around other star systems?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of brightness changes in a star as a planet passes in front of it C) detection of Doppler shifts in the spectra of the parent stars D) detection of reflected starlight
If the Sun collapsed to a neutron star or black hole, Earth would
1) spiral into the Sun's core, 2) remain in its present orbit, 3) spiral away from the Sun, 4) itself undergo collapse, for the variable that changes in Newton's gravitational equation is 5) distance. 6) the mass of the Sun. 7) the mass of Earth. 8) all of these. 9) none of these.