Why do the patterns of the stars in our sky look the same from year to year?
A) because the stars in the constellations move so slowly-typically about the speed of a snail-that their motions are not noticeable
B) because the stars in the constellations are so far away
C) because the stars in the constellations are not moving
D) because the stars in the constellations all move at the same speeds and in the same directions, so they don't change their relative positions
B
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What is h?
What will be an ideal response?
Which of the following is the largest object in the asteroid belt?
A) Ceres B) Io C) Titan D) Europa
A spaceship from another galaxy passes over the solar system directly above a radial line from the Sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80c, for which ? = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the Sun to Earth. When a scientist in the spaceship measures the
Earth-Sun distance and the time it takes her to travel that distance, she finds the results are, respectively a. 9.0 × 10^10 m; 375 s. b. 9.0 × 10^10 m; 625 s. c. 1.5 × 10^11 m; 625 s. d. 2.5 × 10^11 m; 625 s. e. 2.5 × 10^11 m; 1042 s.
The geologic time scale is broken up into time units of different sizes based on
A) eons, eras, periods, and epochs. B) changes in fossilization. C) visible and nonvisible life forms. D) major changes in life forms.