Which of the following objects may have organic particles on its surface as a result of the interaction of sunlight with methane in its upper atmosphere?
a. Io
b. Titan
c. Mimas
d. Ganymede
e. Callisto
B
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The period-luminosity relation for Cepheid and RR Lyrae variable stars can be used for ______________
Fill in the blank(s) with correct word
If gypsum has a hardness of 2, what statement must be true about it?
-It can only be scratched with a knife or a wire nail -It can scratch glass -It can be scratched with a fingernail -It is twice as hard as talc, which has a hardness of 1
How were the rings of Uranus discovered?
A) photometric observations of the occultation of a star made from Earth B) by Percival Lowell, who observed two "bumps" on either side of Uranus C) by William Herschel, while he also found the two largest moons D) by Voyager 2 when it passed by Uranus in 1986 E) by the Hubble Space Telescope in the infrared
A ball is released moving straight up at 15. m/s. At some time later it is falling downward at 15. m/s. What was the magnitude of its average velocity over this time period?
A) 0. m/s B) 30. m/s C) 15. m/s D) 7.5 m/s E) 22. m/s