[bfqllxax] Alpha Centauri before public domain

Which will happen first: a song that came out this year becoming public domain, or humans colonizing Alpha Centauri? O

[rffzzbpi] CA with mostly local neighborhood

Consider cellular automata in which a cell's next state depends on both its local neighborhood and a few possible dista

[rysbedyh] Automatic light switch

Design a light with an ambient light sensor that automatically turns on the light when it becomes dark and turns it off

[ezmpildy] Intragalactic versus intergalactic

The distance between galaxies seems not that much greater than the size of galaxies.  Milky Way diameter 100,000 l

[zlpvwetn] Summer Triangle angles

Data from Hipparcos-2 via ESASky (Science Mode), epoch J1991.25.Below, "inclination" is spherical polar coordinate from