Speed of Light: How Fast It Is, How It Was Measured, and Why It Matters
Quick Answer: The speed of light in a vacuum is exactly 299,792,458 meters per second, which is about 300,000 kilometers per second or 186,282 miles per second. Scientists represent it with the symbol “c.” It is the fastest speed in the universe. Light slows down when it passes through materials like water or glass. Light is the fastest thing in… Continue reading Speed of Light: How Fast It Is, How It Was Measured, and Why It Matters