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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchNASA Ames estimates that 10 to 50 meteorite-dropping events occur worldwide each day. That is an estimate of material reaching the ground—not the number people see, find or recover. NASA Ames estimates that only 2 to 12 of those daily events have the potential to be discovered by people, and says only a handful of witnessed falls occur each year. NASA Ames explains its meteorite-fall estimates.
What does “meteorite strike” mean?
The term can describe different stages of an incoming object, so the numbers depend on what is being counted. NASA distinguishes them this way:
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- Meteoroid: a small particle from a comet or asteroid orbiting the Sun.
- Meteor: the streak of light produced as the particle enters the atmosphere and heats up.
- Meteorite: material that survives the atmospheric passage and reaches the ground. As NASA Science puts it, “When a meteoroid survives a trip through the atmosphere and hits the ground, it’s called a meteorite.”
So a count of atmospheric entries or bright meteors is not the same as a count of meteorite-producing falls. Nor is it the same as the number of witnessed or recovered specimens.
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How many falls could people discover?
NASA Ames estimates that 2 to 12 meteorite-dropping events per day have the potential for discovery by people. The gap between that estimate and the 10-to-50 global daily estimate reflects where falls happen and when: NASA Ames says two-thirds occur over ocean, about a quarter over very uninhabited land, and half of the potentially discoverable events occur on Earth’s night side. The page describes witnessed falls as only a handful each year.
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These are global estimates, not a schedule for any particular place. A daily worldwide average does not mean a meteorite is likely to fall near a specific person or that a local area should expect one at regular intervals.
Why can so many arrive without being noticed?
Earth’s atmosphere destroys most incoming material. NASA Science estimates that 48.5 tons (44 tonnes) of meteoritic material falls on Earth each day and says almost all of it vaporizes in the atmosphere. NASA’s lunar-monitoring page gives a separate estimate of 33 metric tons (73,000 pounds) of meteoroids per day, most of which harmlessly ablates high in the atmosphere. The two pages do not reconcile their different mass estimates, so they should be treated as separately attributed figures, not combined into a single total. NASA Science’s daily mass estimate; NASA’s lunar impact-monitoring page.
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Mass and event counts measure different things. A large amount of dust and small particles can enter the atmosphere while only a smaller fraction survives as recognizable ground-reaching material. NASA Ames says particles from dust size to a few kilograms are usually consumed; surviving fragments slow down and fall at terminal velocity, often dispersing across an area several miles long.
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How often do larger, potentially damaging objects arrive?
The 10-to-50 estimate is about meteorite-dropping events, not destructive asteroid impacts. For larger objects, NASA gives much lower approximate frequencies, and the outcome depends on the object’s size and what happens in the atmosphere or at impact.
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| Object or outcome | Approximate frequency | What the estimate describes |
|---|---|---|
| Automobile-sized object | About once a year | NASA says it enters the atmosphere, creates a fireball and burns up before reaching the surface. NASA, Asteroid Fast Facts. |
| Football-field-sized object causing significant damage | About every 2,000 years or so on NASA’s Asteroid Fast Facts page; about every 5,000 years on another NASA page | These are approximate recurrence estimates, and the cited pages do not establish that they use identical size or damage thresholds. NASA, Asteroid Fast Facts. |
| Object large enough to threaten civilization | Once every few million years | Approximate estimate from NASA’s Asteroid Fast Facts page. NASA, Asteroid Fast Facts. |
These categories should not be read as a single ladder of predictable events. The annual automobile-sized entry usually burns up; the much rarer larger-object estimates refer to potentially damaging impacts, not ordinary meteorite falls.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How often could a meteorite seriously harm someone?
Human harm is far rarer than a meteorite reaching the ground. NASA technical estimates describe serious consequences as very infrequent, but they are models based on assumptions about incoming-object flux, population and how much time people spend outdoors—not observed periodic schedules.
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- A 2017 NASA technical report estimates a fatality recurrence of about one person per several millennia and says small fragments or sand hitting people may occur about once a decade. NASA technical report, 2017.
- A 2019 NASA technical presentation gives a 140-to-8,500-year range for a 50% probability threshold for human fatality, with “~thousands of years (best estimate).” Its upper-end case assumes everyone is outdoors all the time; its lower-end case assumes 5% outdoor exposure and a lower flux. NASA technical presentation, 2019.
Those intervals are model outputs, not predictions of when or where a person will be struck.
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