All the following statements are true. Which one explains the reason that there is not a solar eclipse at every new Moon?
A) The nodes of the Moon's orbit precess with an 18-year period.
B) The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane.
C) The Moon is only about 1/4 as large as Earth in diameter.
D) The Moon goes through a complete cycle of phases about every 29 1/2 days.
B
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How does emission of long wavelength radio radiation from neutral hydrogen help us overcome the shortcomings of visible light in mapping out distant parts of our galaxy?
What will be an ideal response?
Characteristic K x-rays are the result of:
a. inner electron transitions. b. outer electron transitions. c. nuclear electron states. d. buckytubes.
The interstellar clouds called molecular clouds are ________
A) clouds that are made mostly of complex molecules such as carbon dioxide and sulfur dioxide B) the clouds in which elements such as carbon, nitrogen, and oxygen are made C) the cool clouds in which stars form D) the hot clouds of gas expelled by dying stars
A(n) ______________ moon occurs when more than one-half of the Moon's surface appears illuminated
Fill in the blank(s) with correct word