What is Einstein's cosmological constant?
A) the value of the expansion rate of the universe
B) the value of the acceleration of the universe
C) the value that measures the strength of gravity across the universe
D) the size of the cosmological horizon
E) a repulsive force that counteracts gravity and was introduced to allow for a static universe
E
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Stellar parallax is the shift seen across a baseline of 2 AU rather than 1 AU
Indicate whether the statement is true or false
Viewed from afar, the transit of Earth would cause the Sun's brightness to dim by approximately one part in
A) 100. B) 1,000. C) 10,000. D) 100,000. E) a million.
It is July and you are in your hometown. As you travel northward toward the north pole, how does the number of daylight hours vary? How does the number of daylight hours vary as you travel southward toward the south pole?
A spherical mirror has a radius of curvature of 22 cm. If the mirror is concave, its focal length is
A) -11 cm. B) -22 cm. C) 11 cm. D) -44 cm. E) 22 cm.