Why might astronomers someday establish an observatory on the Moon?
What will be an ideal response?
An observatory on the Moon would have many advantages. The Moon has no atmosphere, so the observations would not be limited to the atmospheric "windows" which allow only visual, radio, and narrow windows of short infrared electromagnetic radiation to reach Earth. There would be no light pollution or human-made radio noise to compete with.
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It is generally easier to push an object once it is moving than when you are getting it started. This is because
a. sliding friction is zero. b. sliding friction is less than static friction. c. static friction is less than sliding friction. d. static friction is zero.
Approximately how fast is a person located at the Earth's equator moving around Earth's axis due to the rotation of the Earth?
A) 17,000 km/hr B) 1700 km/hr C) 170 km/hr D) 17 km/hr E) not moving at all
When an earthquake occurs, the point of initial energy release is called the earthquake's ______________
Fill in the blank(s) with correct word
The subduction zone of converging oceanic plates is
marked by a)isolated volcanic mountains such as the Hawaiian Islands. b) a deep oceanic trench. c) a fold mountain range. d) the Moho discontinuity.