________'s theories were based on the very accurate observations made by ________
A) Kepler; Tycho Brahe B) Galileo; Kepler
C) Kepler; Galileo D) Tycho Brahe; Kepler
A
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How much cooler is the universe now (at an age of 4 × 1017 s) than it was at an age of 1 second?
A) Its current temperature is one hundred-millionth (10-8) the temperature at an age of 1 second. B) Its current temperature is one hundred-thousandth (10-5) the temperature at an age of 1 second. C) Its current temperature is one-hundredth (10-2) the temperature at an age of 1 second. D) Its current temperature is one ten-billionth (10-10) the temperature at an age of 1 second.
The daily motion of celestial objects in the sky is caused by
A) the rotation of our planet about its axis. B) the revolution of our planet around the Sun. C) the movement of our planet within the Milky Way. D) the tilt of Earth's axis.
The binding energy of a nucleus is equal to:
a. the mass of the nucleus times c2. b. the energy needed to separate all the nucleons from each other. c. the average energy with which any nucleon is bound in the nucleus. d. the energy needed to remove one of the nucleons.
Contrast the internal structures of the four Galilean moons. How are their internal differences reflected in the nature of their surfaces and other factors like their mean densities?
What will be an ideal response?