quetric
quetric t1_iyxufml wrote
Reply to comment by forte2718 in How are we sure that speed of light and other basic constants are really constants on a large cosmological scale of time and space? by The_Dark_Passenger93
How do we account for red shift without knowing distance? AFAIK the shift itself is the only way we can measure distance at cosmological scales.
quetric t1_iueo4rl wrote
Reply to comment by KerPop42 in Comparison of Nuclear Explosions by MiamiDevSecOps
This is pretty far from beautiful. The graph is confusing because looking at the vertical axis tells you the comparison is by yield, but having the mushroom clouds instead of bars suggests the comparison is by height of the cloud. I suspect the relationship between the two metrics is not linear so they're not interchangeable.
quetric t1_j5w6n75 wrote
Reply to Why do sample return missions such as OSIRIS-REx use their own reentry vehicles instead of just going to the space station for pickup and return with ISS equipment? by PromptCritical725
In addition to what others have said about delta-v required to match the orbital speed of the ISS, there's also the challenge of matching its inclination. Most likely a sample return mission will occur roughly in the solar system invariable plane, since that's where most of the planetary mass is. The ISS orbits at a relatively high inclination and I suspect it would take some creative gravity assists or a lot of delta-v to get in alignment with it.