Which of the following explains why Polaris will no longer be the North Star 1,000 years from now?
A) Earth rotates once each day.
B) Earth orbits the Sun once each year.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
E) The universe is expanding.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
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A space probe leaves the solar system to explore interstellar space. Once it is far from any stars, when must it fire its rocket engines?
A. all the time, in order to keep moving B. only when it wants to speed up C. only when it wants to slow down D. only when it wants to turn E. when it wants to speed up, slow down, or turn
A line of equal longitude is called a
a. meridian. b. zone. c. circle. d. parallel.
Temperature inversions involve a higher temperature at ground level than in the air over the ground
What will be an ideal response?
If n = 5, which one of the following is not an allowed magnetic quantum number m1?
A) 0 B) 2 C) 4 D) 5