Comets are visible chiefly because of reflected ______________
Fill in the blank(s) with correct word
sunlight
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Scientists believe Saturn's moon Phoebe originated from a ____
a. large impact on Titan broke off a piece b. captured Kuiper belt object c. captured asteroid from the asteroid belt d. planetesimal that did not differentiate e. Galilean moon with an orbit that crossed into Saturn's orbit
The absorption lines in the ultraviolet portion of the spectrum of a star that are produced by hydrogen are from the
a. Lyman series. b. Balmer series. c. Paschen series. d. isotopes of hydrogen. e. ions of hydrogen.
Contrast the compositions and heights of the clouds of Earth and Venus
What will be an ideal response?
Sue is traveling toward you at 90 km/hr. She throws a baseball that, according to her, is going at 90 km/hr in the opposite direction. What do you see the ball doing?
A) You see the ball traveling away from you at 90 km/hr. B) You see the ball remaining stationary. C) You see the ball traveling away from you at 180 km/hr. D) You see the ball traveling toward you at 90 km/hr. E) You see the ball traveling toward you at 180 km/hr.