What is the fastest thing in the world?

The fastest thing in the world is light, specifically photons traveling in a vacuum.

• Speed: Light travels at approximately 299,792,458 meters per second (approximately 186,282 miles per second) in a vacuum. This speed is often denoted as c.
• Universal Constant: The speed of light is a fundamental <a href="https://www.wikiwhat.page/kavramlar/universal%20constant">universal constant</a> in physics.
• Relativity: <a href="https://www.wikiwhat.page/kavramlar/Albert%20Einstein's%20theory%20of%20relativity">Albert Einstein's theory of relativity</a> postulates that nothing with mass can travel at the speed of light. As an object approaches the speed of light, its mass increases infinitely, requiring infinite energy to accelerate it further.
• Implications: The speed of light has profound implications for our understanding of the <a href="https://www.wikiwhat.page/kavramlar/universe">universe</a>, including concepts like time dilation and length contraction. It also affects how we perceive the past when observing distant objects. The light we see from distant stars has taken millions or billions of years to reach us.
• Measurement: The speed of light is so fundamental that it's used to define the meter, the base unit of length in the <a href="https://www.wikiwhat.page/kavramlar/International%20System%20of%20Units">International System of Units</a> (SI).