Astrology 102 Chapter 3
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102
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Astronomy
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Dec 6, 2023
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Chapter 3 Quiz Astrology 103
1.) An astronomer finds an object at a distance of 6.8 AU from Earth. Based on the distance, which of the
following is this object most likely to be?
A comet in our solar system
2.) If a radio message were sent toward the nearest star to the Sun and a reply were sent back
immediately on receipt of the message by intelligent beings from a planet near that star, how long after
transmission would we have to wait for a reply?
8.6 years
3.) In 2004, an inhabitant of a planet orbiting a distant star observes the flash of the first nuclear
explosion which occurred in July 1945. Approximately how far away is his solar system from earth?
17.1 pc
4.) If an extraterrestrial being were to send a signal to Earth immediately to confirm the sighting in 2004
of a nuclear explosion on Earth in July 1945, and we were ready to receive such a message, when would
we expect it?
2063 A.D.
5.) The following distance units, arranged in size from smallest to largest, are:
km, AU, ly, pc
6.) How long does it take light to travel from the Sun to Earth?
nine minutes
7.) We know the properties of hydrogen atoms well from studying them in laboratories on Earth. A
fundamental idea in astronomy is that:
a hydrogen atom anywhere else in the universe is the same as it is here.
8.) The element helium was discovered (through spectroscopy) in the atmosphere of the Sun before it
was discovered in trace amounts on Earth. This was possible because:
all helium atoms in the universe are believed to be fundamentally the same.
9.) The study of galaxies gives astronomers important clues about the:
creation of the universe
10.) A scientist observes a new phenomenon that disagrees with the scientist's own explanation or
hypothesis. Following the scientific method, the correct procedure is to:
modify the hypothesis.
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