![]() ![]() Space is a very quiet place.īut sound doesn’t have to move through air – it can just as easily move through water, or through metal wires. Movement of soundīecause sound has to move molecules in order to travel, it’s impossible for sound to move through space, where there are very few molecules. If your ears are working, these nerves then send messages to your brain to tell you that you heard a noise. However, even a miniscule proton would require near-infinite energy to actually reach the speed of light, and humans haven’t figured out near-infinite energy quite yet.When the air molecules inside your ear begin to shake, they wobble tiny hairs inside your ear that are connected to nerves under your skin. The Large Hadron Collider (LHC), the largest and highest-energy particle accelerator on Earth, has boosted protons (particles within atoms) as close to the speed of light as we can get. So, light-speed travel and faster-than-light travel are physical impossibilities, especially for anything with mass, such as spacecraft and humans.Įven for very tiny things, like subatomic particles, the amount of energy ( E) needed to near the speed of light poses a significant challenge to the feasibility of almost light-speed space travel. According to Albert Einstein’s theory of special relativity, summarized by the famous equation E= mc 2, the speed of light ( c) is something like a cosmic speed limit that cannot be surpassed. So will it ever be possible for us to travel at light speed?īased on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. In 1947 humans first surpassed the (much slower) speed of sound, paving the way for the commercial Concorde jet and other supersonic aircraft. At that speed, you could circle Earth more than seven times in one second, and humans would finally be able to explore outside our solar system. The speed of light is an incredible 299,792,458 meters per second. The idea of travelling at the speed of light is an attractive one for sci-fi writers. ![]()
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