Name the three principal divisions of the structure of the Earth's interior and the chemical composition of each
What will be an ideal response?
The core is made of molten iron and nickel, the mantle of silicates, and the crust of still less dense silicates.
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What causes stars to twinkle?
A) It is intrinsic to the stars—their brightness varies as they expand and contract. B) variations in the absorption of light at different depths in Earth's atmosphere C) variable absorption by interstellar gas along the line of sight to the star D) bending of light rays by turbulent motions of air in Earth's atmosphere E) the inability of the human eye to focus on small points of light
How do we think the first generation of stars would have been different from stars born today?
A) They would have lacked elements heavier than hydrogen and helium. B) They would have generated energy through fission rather than fusion. C) They would have all been very low in mass. D) They would have shined only with ultraviolet light, not visible light.
The Sun's evolution from youngest to oldest stage is
A. protostar, red giant, main sequence, white dwarf. B. white dwarf, red giant, main sequence, protostar. C. protostar, main sequence, red giant, white dwarf. D. red giant, main sequence, white dwarf, protostar.
The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K