Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain ____________________ at their centers.
Fill in the blank(s) with correct word
Question 2The ____ of a planet is the region around the planet where the magnetic field is able to deflect the solar wind and other charged particles.
a. aurora
b. magnetosphere
c. hydrosphere
d. corona
e. Schwarzschild radius
Question 3____________________ galaxies have a definite disk component, but contain no evidence of spiral pattern, few hot young stars, and little gas and dust.
Fill in the blank(s) with correct word
Question 4____ are Kuiper belt objects that are in a 3:2 resonance orbit with the orbit of Neptune.
a. Plutinos
b. Charons
c. Protons
d. Lepton
e. Resonons
Question 5Measuring the Doppler shift of material at various distances from the center of a galaxy can be used to construct a(n) ____________________ for that galaxy.
Fill in the blank(s) with correct word
Question 6In terms of mass, Jupiter is made mostly of
a. rock.
b. molten iron.
c. water.
d. hydrogen and helium.
e. carbon dioxide.
Question 7____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.
Fill in the blank(s) with correct word
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