In addition to the conditions required for any solar eclipse, what must also be true in order for you to observe a total solar eclipse?
A) Earth must be near aphelion in its orbit of the Sun.
B) The Moon's umbra must touch the area where you are located.
C) Earth must lie completely within the Moon's umbra.
D) Earth must lie completely within the Moon's penumbra.
E) The Moon's penumbra must touch the area where you are located.
B
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A continuous spectrum is created by a hot ionized gas
a. True b. False Indicate whether the statement is true or false
Match the words at the left to the correct blanks in the sentences at right. Use each choice only once.
A. A camera is an example of an instrument used for _________observations. B. _________ refers to telescopic observations in which we separate an object's light so we can measure its intensity at different wavelengths. C. If we want to confirm that a star's brightness alternately dims and brightens, we need __________ observations of the star. D. The familiar twinkling of the stars is caused by _____________, which also blurs telescopic images. E. Human civilization is responsible for what astronomers call ____________.
Magnetic field strength about a magnet is strongest where magnetic field lines are
A) closer together. B) straightest. C) most curved. D) more spread.
Folded rock layers that resemble an arch are called
a. inclines. b. synclines. c. anticlines. d. paraclines.