25 ms·
Vacuum is good, but inverse-square law still applies. There is almost perfect vacuum between Earth and every star in the galaxy, and yet they don't appear near
by lultimouomo 5y ago
Vacuum is good, but inverse-square law still applies.
There is almost perfect vacuum between Earth and every star in the galaxy, and yet they don't appear nearly as bright as the Sun.
- thfuran 5y agoBut you can see the Andromeda galaxy, which is several quintillion miles away.
- josephg 5y agoSure, but the andromeda galaxy doesn’t have a power budget of 20 watts.
- Sporktacular 5y agoSome photons would make it, just not frequently enough to ascertain any information.