A gravity wave is a vertical wave moving through a stable layer of the atmosphere. A gravity wave is basically a general classification for all types of waves, such as sound waves, electromagnetic waves, lee waves, mountain waves, and much more. Just like electromagnetic waves, gravity waves travel at the speed of light. Considering light travels at 186,000 miles per second, that's really fast. A gravity wave looks like a undulating wave, meaning that it travels an up and down motion. It looks a little like a ripple in water, which forms when you throw a rock in it. It is much harder to detect gravity waves than electromagnetic waves, and although a number of experiments have been performed, we still have not been able to detect gravity waves directly.
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