____________________ is a description of the Ptolemaic model of the solar system.
Fill in the blank(s) with correct word
Question 2Uranium serves as the source of the Sun's energy because
a. uranium atoms can be fissioned into lighter atoms and energy.
b. uranium atoms can be fused into helium and energy.
c. uranium atoms can be fused into hydrogen and energy.
d. none of the above because fusion of hydrogen atoms serves as the Sun's source of energy.
e. none of the above because fusion of helium atoms serves as the Sun's source of energy.
Question 3The first modern astronomer to propose a heliocentric model for the solar system was ____________________.
Fill in the blank(s) with correct word
Question 4____________ of hydrogen atom nuclei in the core replace the heat the Sun ____________ to keep it in equilibrium.
a. Nuclear fusion reactions; loses into space
b. Nuclear fusion reactions; gains from empty space
c. Chemical reactions; loses into space
d. Chemical reactions; gains from empty space
e. Nuclear fission; loses into space
Question 5Ptolemy formulated a(n) ____________________ model of the solar system to predict positions of the Sun, Moon, and planets.
Fill in the blank(s) with correct word
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