Fall 2000 ASTR 1120-001 Quiz 6
Choose the single best answer and enter it on your scantron form.
Be sure to fill in your
name and
student number.
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Which of the following is the single most important evidence
in favor of the Cosmological Principle:
(a) the Hubble diagram, showing the expansion of the Universe;
(b) the predictions of General Relativity;
(c) the Planck spectrum of the Cosmic Microwave Background (CMB);
(d) the uniform large scale distribution of galaxies in the Universe;
(e) the uniformity of the CMB.
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The spatial center of the Universe is thought to be:
(a) you;
(b) the Sun;
(c) in the direction of Sagittarius;
(d) M87 at the center of the Virgo cluster;
(e) nowhere.
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The Cosmic Scale Factor is:
(a) about 15 gigalightyears;
(b) the ratio of the actual density of the Universe to the critical density;
(c) another name for the Hubble constant;
(d) a measure of the size of the Universe, which expands with the Universe;
(e) the distance to the horizon of the Universe.
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Which of the Universes in the diagram at right probably describes ours?
(e) Cosmologists still have little clue which is true.
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In January 1998,
the Hubble diagram of high redshift supernovae
revealed the unexpected and revolutionary phenomenon that the Universe is:
(a) expanding;
(b) accelerating;
(c) closed;
(d) flat;
(e) open.
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In April 2000,
balloon observations of the CMB with Boomerang
revealed with unprecedented precision that the Universe is:
(a) expanding;
(b) accelerating;
(c) closed;
(d) flat;
(e) open.
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In the Boomerang image of the CMB at right,
the size of the blobs is roughly the size of:
(a) a star-forming region;
(b) a galaxy;
(c) a supercluster of galaxies;
(d) the horizon at Recombination;
(e) the current horizon distance.
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Which of the following statements about the epoch of Recombination is false:
(a) the expansion of the Universe began at that time;
(b) the temperature then was about 3,000 K;
(c) protons and electrons combined into neutral atoms;
(d) the Universe became transparent to electromagnetic radiation;
(e) the CMB comes to us from that time.
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Which of the following statements about the CMB is
false:
(a) it was discovered by Arno Penzias and Robert Wilson working at Bell Labs in 1964;
(b) it has a Planck spectrum to exquisite accuracy;
(c) after correcting for our motion through it, the CMB is isotropic to a few × 10-5;
(d) the CMB was emitted at our horizon;
(e) it is one of the main evidences in favor of the hot Big Bang.
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In the COBE image of the CMB at right,
the `dipole' pattern is caused by:
(a) microwave radiation from Earth;
(b) microwave radiation from the Milky Way;
(c) temperature fluctuations in the CMB;
(d) the Planck spectrum of the CMB;
(e) motion of the Solar System through the CMB.