The temperature of outer space is
A) zero.
B) about 2.7 kelvin.
C) meaningless.
D) none of the above
Answer: B
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For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________
Fill in the blank(s) with correct word
When strong solar winds are displaced poleward by our magnetic fields, we get:
A) the Van Allen radiation belts. B) intense auroral displays. C) sunspots. D) hurricanes in the tropics. E) droughts and dust bowls in the American West.
Which of these is NOT now on the surface of Mars?
A) Mars Global Surveyor B) Viking 1 C) Pathfinder D) Sojourner E) Spirit
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z has a positive charge. E. Z is neutral (has no net charge).