Historically astronomy was limited to visible light; meaning light we can see with our eyes. Visible light is still particularly important for astronomers on the ground even though we have electronics that can detect all sorts of other wavelengths of light we cannot see with our eyes.

What is it about Earth's atmosphere that makes visible light more useful than most other wavelengths of light for astronomers on the ground?

Note: The answer you give should have nothing to do with whether we can see particular type of light using our eyes.

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Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction