Which of the following best describes what we mean by the focal plane of a telescope?
A) It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope.
B) It is the upper surface of the telescope's primary lens or mirror.
C) It is the lower surface of the telescope's primary lens or mirror.
D) It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view.
A) It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope.
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Who was the first to propose solar system formation with gravity as a key component of the hypothesis?
a. Isaac Newton b. René Descartes c. Pierre-Simon de Laplace d. Georges-Louis de Buffon e. Emanuel Swedenborg
According to current understanding, how did the first generation of stars differ from stars born today?
A) They contained much more hydrogen and helium than stars born today. B) They were much cooler in temperature than most stars born today. C) They were much more likely to be members of binary star systems than stars are born today. D) They were much more massive than most stars born today.
Consider the following statement: "Rocky asteroids are found primarily in the asteroid belt and Kuiper belt, while icy comets are found primarily in the Oort cloud." What's wrong with this statement?
A) The Kuiper belt contains icy comets, not rocky asteroids. B) Asteroids are not really made of rock. C) Comets are not really icy. D) The Oort cloud has nothing to do with comets. E) The statement is accurate as written.
A very tentative explanation of observations of some regularity of nature is a(n)
a. scientific law. b. theory. c. experiment. d. hypothesis.