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distance = velocity time velocity = 0.5 cm/s
time = distance / velocity = 3 cm/(0.5 cm/s) = 6 s
= 500 km/s
= 0.508 Mpc/Gyr
When were galaxies in the same place?
time = distance / velocity = 7 Mpc/(0.508 Mpc/Gyr)
= 13.8 Gyr ago
Time = distance/velocity
= 1/(71 km/s/Mpc)
= 13.8 Gyr
: north/south and east/west
= 3.1415926… 2 = 6.28…
How do the properties of positively curved space differ from flat space?