The fact that the Earth has moved along its orbit in the time it took to rotate once is the reason for
A) the position of the Celestial Equator.
B) precession.
C) the difference between solar and sidereal time.
D) Earth's 23.5-degree tilt.
E) seasons.
C
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If H equals 70 km/sec/Mpc, then a galaxy with a radial velocity of 2100 km/sec has a distance of approximately
a. 2170 Mpc b. 2030 Mpc c. 30 Mpc d. 0.03 Mpc e. 147,000 Mpc
According to the nebular theory of solar system formation, what key difference in their early formation explains why the jovian planets ended up so different from the terrestrial planets?
A) The terrestrial planets formed inside the frost line of the solar nebula and the jovian planets formed beyond it. B) The jovian planets formed in a region with a much higher density of hydrogen and helium gas. C) The terrestrial planets accreted from rock and metal, while the jovian planets were formed by giant balls of pure hydrogen and helium gas. D) The jovian planets began from planetesimals made only of ice, while the terrestrial planets began from planetesimals made only of rock and metal.
In a single-slit diffraction experiment, the central maximum is broadened if the wavelength of light increased
Indicate whether the statement is true or false
Match the accomplishment to the person
A) Tycho collected data, Kepler found elliptical orbits, Newton explained in terms of physics. B) Tycho collected data, Newton found elliptical orbits, Kepler explained in terms of physics. C) Kepler collected data, Tycho found elliptical orbits, Newton explained in terms of physics.