What is a quasar?
A) a starlike object that actually represents a bright patch of gas in the Milky Way
B) a very large galaxy thought to be formed by the merger of several smaller galaxies, typically found in the center of a galaxy cluster
C) a specialized astronomical instrument for observing distant stars
D) the extremely bright center of a distant galaxy, thought to be powered by a supermassive black hole
E) another name for very bright stars of spectral type O
D
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Which of the following statements about neutrinos is true?
A) Neutrinos can be attracted or repelled by electrically charged particles. B) Neutrinos have a mass that is much larger than the mass of an electron. C) Neutrinos respond to the strong nuclear force. D) There are three types of neutrinos, and these represent three of the six known types of lepton. E) Neutrinos respond to the force of gravity.
________ are hot compact remnant stars whose mass is typically between one and several times that of the Sun, but their size is only 10 km or less.
A. Neutron stars B. White dwarfs C. Pulsars D. Black dwarfs
Features called "Tiger Stripes" are found on the surface of which Jovian moon?
A) Europa B) Ganymede C) Enceladus D) Triton
A lab specimen is 15.2 mm from a convex lens. The image is 4.0 mm tall and 9.0 cm from the lens. How tall is the specimen?
A) 6.8 mm B) 5.4 mm C) 1.7 mm D) 0.68 mm