Measuring the amount of deuterium in the universe allows us to set a limit on ________
A) the acceleration of the universe
B) the total amount of mass in the universe
C) the density of ordinary (baryonic) matter in the universe
D) the current age of the universe
C
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The ____ is responsible for binding the electrons to the nucleus
a. Kirchhoff's law b. ground state c. temperature d. Coulomb force e. Balmer series
This photo shows the Large Magellanic Cloud, or LMC for short. Based on what you have learned in about the LMC from your text, which of the following statements about the LMC is not true?
A) Galaxies similar to the LMC are extremely rare. B) It is an irregular galaxy. C) It orbits the Milky Way Galaxy. D) Its color indicates active star formation.
How does Jupiter's core compare to Earth?
A) It is the same size and mass. B) It is about 10 times larger both in size and mass. C) It is about 10 times larger in size and the same mass. D) It is about the same size but is 10 times more massive. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
According to general relativity, a black hole is
A) an object that cannot be seen. B) a hole in the observable universe. C) a place where light travels slower than the normal speed of light. D) a place where light travels faster than the normal speed of light. E) a place where there is no gravity.