this post was submitted on 20 Jan 2026
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I was watching a SciFi tv show where large objects had an outer speed limit of 18000 kph and that got me wondering what things in everyday life are faster than even 500 kph.

I know bullets can be fast, but they are not exactly everyday life (at least in my life).

I included mass for obvious relativistic reasons.

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[–] deHaga@feddit.uk 4 points 3 weeks ago

Concorde was supersonic

[–] trolololol@lemmy.world 4 points 3 weeks ago (1 children)

Rockets?

International space station goes around the earth at about 7km/s if I recall correctly. And it's quite big.

That's the kind of speed of any rocket going to meet with ISS or being put into earth orbit. Things reentrying from orbit hit the atmosphere at about that speed too.

Things going or coming to the moon need slightly more, I think ballpark is 10km/s, and above that you're travelling to Mars, asteroids, Venus, Jupiter, etc etc.

[–] PeriodicallyPedantic@lemmy.ca 3 points 3 weeks ago (2 children)

I feel like that's even less like "everyday life" than OPs example of bullets lol

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[–] NigelFrobisher@aussie.zone 3 points 3 weeks ago (1 children)

Every mass is moving really fast from a certain point of view.

[–] exasperation@lemmy.dbzer0.com 2 points 3 weeks ago

Well then you are lost!

[–] diabetic_porcupine@lemmy.world 3 points 3 weeks ago

There’s a dirty joke in here somewhere

[–] kreskin@lemmy.world 3 points 3 weeks ago* (last edited 3 weeks ago)

radio waves dont have mass but do have relativistic mass. And you didnt clarify whether relativistic mass counted, so I'm going to go with radio waves. They travel at the speed of light. I am the winner. I'd like my nobel prize in literature now.

[–] melsaskca@lemmy.ca 2 points 3 weeks ago (1 children)

Why? What are you planning?

[–] 5715@feddit.org 4 points 3 weeks ago

For the future (most plans are). /j

I was planning on getting information (mostly useless and anecdotal to me).

[–] ZeroGravitas@lemmy.dbzer0.com 2 points 3 weeks ago (2 children)

A skydiver's terminal velocity is about 90m/s (320km/h). Going beyond that requires propulsion.

Otherwise a visit to Japan or China might serve, Maglev trains can reach speeds in excess of 600km/h.

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[–] Kolanaki@pawb.social 2 points 3 weeks ago

Me when someone hits me up for a booty call.

[–] cyberpunk007@lemmy.ca 2 points 3 weeks ago (1 children)

In American schools it seems to be bullets

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[–] Rai@lemmy.dbzer0.com 2 points 3 weeks ago

Me, at the end of any social engagement.

It’s like that episode of Simpsons where they’re filming something at the Simpsons’ house and Homer learns there’s snacks. He suddenly becomes a Homer-shaped cloud of dust.

[–] DeathByBigSad@sh.itjust.works 2 points 3 weeks ago (1 children)

When you were a kid: The velocity of the adrenaline rushing to your brain triggering a "fight or flight" mode (mostly flight) after you hear the sound of your mother saying your full name in her native dialect.

(Actually the fear remains well into adulthood)

[–] Tar_alcaran@sh.itjust.works 3 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

Adrenaline is released from the adrenal glands near the kidneys. From there, it first has to flow back to the heart, through the lungs, then back to the heart, and only then to the brain and the rest of the body. One full loop of your circulation takes about a minute at rest, and half a minute when your heart is really pumping, so lets take at least 20 seconds.

[–] topherclay@lemmy.world 2 points 3 weeks ago

Yes but you haven't heard this guy's mother saying it in her native accent. It really gets the blood flowing.

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