Suppose we imagine the Sun to be about the size of a grapefruit. How big an area would the orbits of the eight planets of the solar system cover?
A) the size of a typical dorm room
B) the size of a typical campus building
C) the size of a typical campus
D) the size of a small city
E) the size of a western state (e.g., Colorado)
C
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Why is the cosmic microwave background (CMB) so cold if the early Universe was so hot?
a. Enough time has passed for matter in the universe to release enough heat to cool down. b. The CMB constantly interacts with atoms, which effectively cool down the photons. c. The expansion of the Universe has redshifted those photons to an effectively cooler temperature. d. Misleading; The big bang was initially hot but the CMB was released from cold material much later on.
Discuss why astronomers no longer consider Pluto a planet
What will be an ideal response?
The idea of uniformitarianism suggests that
A) the natural laws that operate today are different than those that have operated in the past. B) sediments are laid down layer upon layer with younger layers always on the top. C) the processes and natural laws that operate today have been valid throughout geologic time. D) all rocks layers are originally uniform.
A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The velocity of the 1800 kg car after the collision is
A. 3.0 m/s WEST. B. 1.0 m/s EAST. C. 4.0 m/s EAST. D. 4.0 m/s WEST. E. 1.0 m/s WEST.