On the scale of the cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in a solar system?
A) 1 second ago
B) 1 day ago
C) 1 week ago
D) December 25
E) December 30
A) 1 second ago
Physics & Space Science
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Approximately how many comets are thought to be in the Oort cloud?
A) a thousand B) a million C) a billion D) a trillion E) a quintillion
Physics & Space Science
Suppose you stand on a weighing scale and all of a sudden the atmosphere vanishes. The reading on the scale would
A) increase. B) decrease. C) remain the same.
Physics & Space Science
Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity
A) decreases with time to reach the top. B) remains constant. C) increases with time to reach the top.
Physics & Space Science
A rocky leftover planetesimal orbiting the Sun is
A) a comet. B) a meteor. C) an asteroid. D) a meteorite. E) possibly any of the above
Physics & Space Science