Anything solid of decent mass can basically do us in. A glass bottle with an I love Kitty logo on it at 70mph right to the skull for example. So yeah, a rock, so long as it is large enough, could do it.
If you make a piece of dust of about 1microgram fly to someone at about 99% of c, or about 290’000km/s, with Ek=(1/2)mv², we get an energy equivalent to 42’050’000J, or about 10kg of TNT.
The dust would probably vaporise instantaneously, so it would be the resulting explosion that would be deadly if you fired at point blank range.
But if you find a dust accelerator that can get enough power for that. It stays technically possible.
Anything solid of decent mass can basically do us in. A glass bottle with an I love Kitty logo on it at 70mph right to the skull for example. So yeah, a rock, so long as it is large enough, could do it.
It’s all about the joules imparted.
A small enough rock going fast enough is just as deadly as a large one traveling slower.
Below the mm size it does get harder to make something deadly.
If you make a piece of dust of about 1microgram fly to someone at about 99% of c, or about 290’000km/s, with Ek=(1/2)mv², we get an energy equivalent to 42’050’000J, or about 10kg of TNT.
The dust would probably vaporise instantaneously, so it would be the resulting explosion that would be deadly if you fired at point blank range.
But if you find a dust accelerator that can get enough power for that. It stays technically possible.
Someone stuck their head into a particle accelerator remember?
https://en.wikipedia.org/wiki/Anatoli_Bugorski
In general you need to be in vacuum for any of this to work because a small mass has a small mean free path in atmosphere.
That’s just exponentials coming into play. Area vs mass.
A micrometeorite can sure fuck up an astronaut at orbital velocities.
Yeah but that’s in near vacuum.
Hmm what if it didn’t have the hello kitty logo?