Compared to a smaller-objective lens, a larger-objective lens makes a star's image
a. brighter.
b. dimmer.
c. no effect.
a
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What evidence do we have that life arose fairly quickly on Earth?
What will be an ideal response?
What happens during the apparent retrograde motion of a planet?
A. The planet rises in the west and sets in the east. B. The planet moves backward through the sky over the course of a night. C. The planet appears to move westward with respect to the stars over a period of many nights. D. The planet moves backward in its orbit around the Sun.
Metal solders have low melting temperatures relative to those of the two components in the solder, because metal solders have ___________phase diagrams.
Fill in the blank(s) with the appropriate word(s).
The direction of the Moon's orbit about Earth is
a. westward. b. eastward. c. clockwise, as viewed from above Earth's North Pole. d. none of these.