The "close encounter hypothesis" suggested that the planets formed after a near-collision between our Sun and another star. If this hypothesis were correct, which of the following would be true?
A) Planetary systems would be very rare.
B) Planetary systems would be very common.
C) Most planetary systems would have their jovian planets closer to their stars and their terrestrial planets farther from their stars.
D) Most planetary systems would have the same number of planets as our own.
E) All planetary systems would be at least 4 billion years old.
A) Planetary systems would be very rare.
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A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is 8 m/s2
a. True b. False Indicate whether the statement is true or false
Suppose the amount of fish caught worldwide, assumed to be a small proportion of the total fish population, grows at an annual rate of 3%. About how long will it take for the fish catch to double?
a. 10 yr b. 13 yr c. 18 yr d. 23 yr e. 33 yr
According to the unified model of active galactic nuclei, ___________ is in the center surrounded by _____________with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle
a. a supermassive black hole; an accretion disk b. a supermassive black hole; empty space c. no black hole; an accretion disk d. no black hole; empty space
According to special relativity, tomorrow's travelers can travel
A) only forward in time. B) backward in time. C) both forward and backward in time.