Which of the following best describes what we mean by the focal plane of a telescope?
A) It is the upper surface of the telescope's primary lens or mirror.
B) 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.
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.
B
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A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The velocity
a. is zero. b. has its largest magnitude. c. points up. d. points down.
In 1928, the International Astronomical Union (IAU) established _______________ official constellations with carefully defined boundaries that together include every part of the sky
Fill in the blank(s) with correct word
Ninety percent of all stars fuse helium to form carbon and lie on the main sequence
a. True b. False Indicate whether the statement is true or false
In what manner have astronomers and physicists made tests to confirm that Einstein's theory of general relativity is actually a proper description of gravitational phenomena?
What will be an ideal response?