light hour
light minute
light year
light-year
light second
jiffy
interval
light day
c
light speed
speed of light
miles
light week
metre
index of refraction
faster-than-light
refractive index
high vacuum
kilolight
light century
light millennium
spat
meter
path length
microparsec
Hubble length
megaparsec
rope
Planck acceleration
light eon
kiloparsec
light decade
supercurvature
gigaparsec
scalarvac
light month
jump
gigalightyear
away
hour
off
stretch
light equation
piece
parallax second
siriometer
hot dark matter
mileage
Planck momentum
milliparsec
teraparsec
four-velocity
hairsbreadth
hair's-breadth
in vacuo
long
lightspeed
whisker
Local Volume
hair
shortly
mile
Astronomical Unit
far
AU
plenoptic
millikelvin
ultrarelativistic
luminal
mean solar time
absolute magnitude
mean time
furthest
millimagnitude
gigametre
microfortnight
event
ways
secpar
parsec
subvacuum
sub-light
nonvacuum
slant range
Planck temperature
subspace
long haul
void
step
stone's throw

English words for 'the distance light travels in a vacuum in one hour; approximately one billion kilometers'

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