Interstellar clouds usually form groups of stars that leave the main sequence at the same time.
Answer the following statement true (T) or false (F)
False
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During one day and night in the mid-northern hemisphere, the stars near the north celestial pole
a. rise in the east. b. set in the west. c. circle the north celestial pole counter-clockwise. d. circle the north celestial pole clockwise.
Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies
Indicate whether the statement is true or false
The refractive power of a lens used as a magnifying glass is negative
Indicate whether the statement is true or false
The magnifying power of a telescope equals:
A) the diameter of the primary lens or mirror of the telescope. B) the focal length of the primary mirror or lens divided by the focal length of the eyepiece. C) the diameter of the eyepiece of the telescope. D) the focal length of the eyepiece divided by the focal length of the objective of the telescope.