Suppose that Jupiter had never existed, and there was no planet in our solar system between Mars and Saturn. How would we expect this to have affected Earth?
A) Earth would have been hit by many more comet impacts.
B) There would not have been any effect, since Jupiter is in the outer solar system and Earth is in the inner solar system.
C) Earth's orbit would have been unstable, and our planet would have spiraled into the Sun.
D) There would be no water on Earth.
A
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An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
The concept of force is fundamental to
A) Newton's theory of gravitation. B) Einstein's theory of gravitation. C) both of these D) neither of these
In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
A single slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum, using monochromatic light of 490-nm wavelength. What is the width of the slit?
A) 762 nm B) 700 nm C) 637 nm D) 668 nm E) 731 nm