A bat is flying through the night from a cave near the Wayne Manor. Searching for food the bat sends out a series of clicks into the air to find moths and flies. The bat finds a swarm of flying insects 8 meters away. (Speed of Sound in Air: 343 m/s) What type of signal is the series of clicks called? Radar How long would it take for the clicks to reach the swarm? How long would it take for the clicks to bounce off the swarm and reach the bat?

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Q: What does a vector's curl mean in practice?

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.