Why are telescopes sometimes called "time machines"?
A) because the author, H.G. Wells, used the term to describe telescopes in a book
B) because some of the oldest telescopes are still in use today
C) because observations of distant objects reveal them as they were in the past
D) because astronomers can use telescopes to see the Milky Way as it was when it was much younger
E) It's a journalistic misnomer: you cannot travel into the past or the future.
C
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The strength of a rock depends on its composition, its temperature, and the surrounding pressure
Indicate whether the statement is true or false
The fact that two electrons cannot occupy the same quantum state at the same time is the Heisenberg exclusion principle
a. True b. False Indicate whether the statement is true or false
The assumption of isotropy states that
a. the Universe looks the same at all epochs. b. the Universe looks the same from all locations over sufficiently great distances. c. the Universe looks the same in all directions over sufficiently great distances. d. the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. e. None of the other choices are correct.
What did Tycho do that advanced astronomy significantly?
a. He realized that orbits didn’t have to be circles, they could be ellipses. b. He made more accurate observations than anyone before him. c. He thought of the idea of circles moving on circles (epicycles) to explain planetary motion.