How much of the Earth's surface is experiencing night at any time?
a. less than one-half, because of the tilt of the equator to the ecliptic plane
b. more than one-half, because of the precession of the poles
c. exactly one-half
d. all of the night sky
c
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Where are the Cepheid and RR Lyrae variable stars located on the H-R Diagram?
a. just above and to the right of B type stars b. just above and to the right of O type stars c. in the variable strip d. in the instability strip e. outside the H-R Diagram as missing items
The Murchison meteorite, a carbonaceous chondrite, contained many of the amino acids needed by living things on Earth
Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
1. In the situation described in problem R4T.4, the train passengers are moving, but Rob is at rest. Therefore, the train passengers measure less time between the events than Rob does 2. The coordinate time between two given events is shortest in the inertial frame where their spatial separation is the smallest.
Add and and express your answer in milligrams (mg) to the correct number of significant figures
A) 4.64 × 107 mg B) 4.64 × 104 mg C) 4.64 × 105 mg D) 4.64 × 106 mg