felixsullivan
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Sunday 03 May 2026 09:55:27 GMT
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![Light travels at 299,792 km/s (186,282 mi/s) in a vacuum because it consists of massless photons, which must always move at this speed. According to Einstein’s theory of relativity, nothing with mass can reach or exceed this limit, meaning we see distant objects as they were in the past. A person 80 light-years away would appear as they looked 80 years ago. The speed of light was first measured by Ole Rømer in 1676 using Jupiter’s moons, proving it was not instantaneous. Later, Albert A. Michelson refined its value, making it one of physics most important constants. This speed also forms the basis of Einstein’s equation E = mc², linking energy and mass. Despite being incredibly fast, light’s finite speed is a major challenge for space exploration: Communicating with or traveling to distant planets would take years or centuries, making real-time interaction impossible, and overcoming this barrier would require future technologies like warp drives or wormholes. --- 💡 Learn More: Interstellar astronauts would face years-long communication delays due to time dilation - Space.com (https://www.space.com/time-dilation-interstellar-communication-delays) [Sources] Gibbs, Philip (1997).](/video/cover/7548163303114165535.webp)
