The distinguishing feature of a starburst galaxy is ________
A) strong radio emission from "lobes" of material well outside the visible boundaries of the galaxy
B) a very large luminosity compared to the total luminosity of the Milky Way
C) a rate of star formation that may be 100 or more times greater than that in the Milky Way
D) the presence of an unusually large number of binary star systems containing X-ray bursters
C
You might also like to view...
Which of the following was the most perfect region according to Aristotle's philosophy?
A) The center of the Sun B) The heavens C) Earth's surface D) Earth's center
The mean free path of an oxygen molecule is 2.0 × 10-5 m, when the gas is at a pressure of 120 Pa and a temperature of 275 K
The molecular mass of oxygen is 32.0 g/mol and the Boltzmann constant is 1.38 × 10-23 J/K, Avogadro's number is 6.02 × 1023 molecules/mole, and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. Assuming that the molecules are moving at their root-mean-square speeds, the average time interval between collisions of an oxygen molecule is closest to A) 20 ns. B) 43 ns. C) 95 ns. D) 200 ns. E) 420 ns.
The single most important determinant of the temperature, density, radius, luminosity, and pace of evolution of a protostar is its
A) molecular composition. B) chemical composition. C) spin. D) mass. E) magnetic field.
Half-frozen fruit punch is always sweeter than the same fruit punch completely melted because
A) the sugar sinks to the bottom. B) crystallization is a purifying process. C) the half-frozen fruit punch is warmer. D) sugar molecules are less soluble in a half-frozen solution.