What Is Light? What Are Radio Waves? Drop a pebble into a pool and a water wave radiates outward. The wave consists of highs and lows in the water level. Light and radio and cell phone transmissions are also waves: they radiate outward from the sun, from radio antennas or…
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The Moon is Earth’s only natural satellite…
The Moon is Earth’s only natural satellite and is the fifth largest satellite in the Solar System … The Moon is the largest natural satellite in the Solar System relative to the size of its planet, a quarter the diameter of Earth and 1/81 its mass, and…