If the Sun collapsed to a black hole, Earth's gravitational attraction to it would be
A) more.
B) less.
C) the same.
Answer: C
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The Hope Diamond weighs 44.5 carats. There are 200 mg per carat. How many kilograms does the Hope Diamond weigh?
A) 0.000890 kg B) 0.00890 kg C) 0.0890 kg D) 0.890 kg E) 8.90 kg
The "surface" of a black hole is known as the _______________
a. core b. corona c. photosphere d. event horizon
How do we know there was a big bang?
What will be an ideal response?
The number of technological civilizations in our galaxy is limited by
a. the number of stars in our galaxy. b. the fraction of stars with planets. c. the number of planets per star in habitable zones longer than a few billion years. d. the fraction of suitable planets where technical life forms evolve. e. the number of stars in our galaxy, the fraction of stars with planets, the number of planets per star in habitable zones longer than a few billion years, and the fraction of suitable planets where technical life forms evolve.