What Is Lightning, Really? (And What Makes Thunder?)

"Lightning never strikes the same place twice." It does. The US National Weather Service says the Empire State Building is hit an average of 23 times a year. In plain words, no maths: why lightning hits tall, pointy, isolated things again and again, how ice bumping inside a storm cloud fills it with electric charge, why lightning is a giant spark, why the flash you see actually travels upwards, why it's about 5 times hotter than the surface of the Sun, how that heat makes thunder, why thunder rumbles, and how to tell how far away a flash was just by counting. The only safety information in this video is quoted from the US National Weather Service. For everything else, see their lightning safety page: https://www.weather.gov/safety/lightning More everyday science in plain words: Why does the Moon change shape?    • Why Does the Moon Change Shape? (It's Not ...   0:00 What is lightning, really? 0:36 You're in good company 1:05 A fair hearing: never the same place twice? 2:11 A giant spark 2:38 How a cloud gets charged 4:01 The flash, step by step 4:49 Cloud to cloud 5:03 Hotter than the Sun 5:23 What makes thunder 5:52 Why thunder rumbles 6:31 Flash, then bang 6:48 Count the seconds 7:22 In the Weather Service's words 7:52 Recap Sources: NWS, "Lightning Myths": lightning often strikes the same place repeatedly, especially tall, pointy, isolated objects; the Empire State Building is hit an average of 23 times a year; height, pointy shape and isolation are the dominant factors, and metal makes no difference to where lightning strikes: https://www.weather.gov/safety/lightn... NWS, "Understanding Lightning Science": about 25 million lightning flashes a year in the US: https://www.weather.gov/safety/lightn... NWS, "Understanding Lightning: Thunderstorm Electrification": ice crystals and graupel collide in the updraft, charge separates, the top of the cloud becomes positive and the lower part negative: https://www.weather.gov/safety/lightn... NWS, "Understanding Lightning: Thunderstorm Electrification" and "Lightning Science" pages: the stepped leader, upward streamers from tall objects, and the return stroke: https://www.weather.gov/safety/lightn... NOAA National Severe Storms Laboratory, "Severe Weather 101: Lightning Basics": lightning is a giant spark; air insulates until the charge builds up enough; graupel and ice crystals collide and separate; tall objects send up sparks to meet the downward channel: https://www.nssl.noaa.gov/education/s... NOAA NSSL, "Lightning Types" / "Lightning FAQ": roughly 5 to 10 times as many cloud flashes as ground flashes: https://www.nssl.noaa.gov/education/s... NWS, "Understanding Lightning: Thunder": air in the channel up to 50,000 °F, 5 times hotter than the surface of the Sun; rapid expansion makes thunder; why it rumbles; sharp crack = nearby, rumble = at least several miles away; about 5 seconds per mile, divide by 5; "Keep in mind that you should be in a safe place while counting"; thunder can be heard only about 10 miles away: https://www.weather.gov/safety/lightn... NWS, "Lightning Safety": "When Thunder Roars, Go Indoors"; if you hear thunder, you are likely within striking distance of the storm: https://www.weather.gov/safety/lightning NOAA NSSL, "Lightning Basics" (above): the outward shock wave becomes ordinary sound within a short distance; divide the seconds by 5 for miles or by 3 for kilometres. Footage: AI-generated clips (Google Flow) and Pixabay. Narration voice is AI-generated. New here? Wonder Simply explains how everyday things work, in plain words. Three times a week we take one everyday mystery and explain it, checked against real sources. Know someone who still says lightning never strikes the same place twice? Send them this video. #science #explained #lightning