What other information do we combine with the luminosity of a Type Ia supernova to measure its distance?
A: energy.
B: apparent brightness.
C: temperature.
D: size.
E: redshift.
Ans: B: apparent brightness.
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Eighty-eight prominent groups of stars in the sky are called the _______________
a. constellations b. local groups c. clusters d. galaxies
The mass of a galaxy's central black hole is related to the mass of the galactic bulge. This implies that ____
a. central black holes formed when the galaxy bulges formed b. central black holes have grown during the galaxy's lifetime as the galactic bulge has grown c. galactic bulges shrink over time as mass is consumed by the central black hole d. central black holes cause the formation of galactic bulges e. black holes are only present in spiral galaxies
Which of the following may be determined using Ampere's law?
a) electric fields due to current carrying wires b) magnetic forces between two current carrying wires c) magnetic fields due to current carrying wires d) magnetic forces acting on charged particles e) magnetic fields due to permanent magnets
Based on current evidence, when is/was liquid water abundant on the surface of Mars?
A) only before about 3 billion years ago B) only during the first 1 million years of Mars's existence C) Water comes and goes, with the most recent water flows occurring a few thousand years ago. D) only during the most recent 1 billion years of Mars's history