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Telescopes at sea level can observe visible light, radio waves, and a small portion of infrared and ultraviolet light that are able to penetrate the Earth's atmosphere. Other forms of light such as X-rays and gamma rays are absorbed by the atmosphere and cannot be observed at sea level.
The P-51 Mustang has a maximum speed of around 440 mph (704 km/h) at sea level.
sea level
Mean sea level (MSL) which is the average level of the sea. Determinig "sea level" is a very complex measurement. All other altitude measurements in aviation, in one way or another, are referenced from the mean sea level.
Chipping Norton is approximately 600 feet above sea level.