In Kepler's model of the Universe, what was the purpose of the five regular solids?
a. To differentiate the six planets
b. To define the shape of each of the orbits
c. To describe the internal shape of each planet
d. To be spacers for the orbits of the six planets
e. To support the calculations of each orbital period
d
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A megaparsec is equivalent to
a. 3.26 light-years. b. 206,265 AU. c. the age of our solar system. d. a million parsecs. e. the diameter of the Milky Way galaxy.
What was the frost line of the solar system?
A) the distance from the Sun where temperatures were low enough for metals to condense, between the Sun and the present-day orbit of Mercury B) the distance from the Sun where temperatures were low enough for rocks to condense, between the present-day orbits of Mercury and Venus C) the distance from the Sun where temperatures were low enough for hydrogen compounds to condense into ices, between the present-day orbits of Mars and Jupiter D) the distance from the Sun where temperatures were low enough for asteroids to form, between the present-day orbits of Venus and Earth E) the distance from the Sun where temperatures were low enough for hydrogen and helium to condense, between the present-day orbits of Jupiter and Saturn
What is the difference in frequency for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 × 10^7 m-1.)
a. 5.65 × 10^-13 Hz b. 31 Hz c. 1.77 × 10^12 Hz d. 2.55 × 10^16 Hz e. 1.02 × 10^17 Hz
The ocean crust
A) becomes progressively younger away from the mid-ocean ridges. B) is the same age worldwide. C) becomes progressively older away from the mid-ocean ridge. D) ranges in age, the oldest ocean crust is in the Atlantic and the youngest is in the Arctic.