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433 Eros
90377 Sedna
Earth
Eratosthenes
Gravitational constant
International System of Units
Interstellar medium
Kilometre
Length
Light-year
Mars
Milky Way
Moon
Orders of magnitude (length)
Parallax
Parsec
Pluto
Proxima Centauri
Semi-major axis
Solar mass
Space probe
Speed of light
Star
Sun
Transit of Venus
Voyager 1
Key terms:
astronomical unit
astronomical unit in metres
au
au from the sun
barycentric dynamical time
calculated
celestial
definition
distance
ephemerides
ephemeris
estimate
general relativity
gravitational constant
gravitational field
heliocentric
iau
inner
interstellar
jpl
kuiper belt
length
mean
measurement
metres
metres per
newtonian
observing
orbit
outer oort cloud
parallax
per century
planetary
planets
positions
proper
radiometric
roughly
solar
solar system
speed of light
stadia
sun
terrestrial
thinsp
unit
unit distance
value
value of the astronomical unit
venus
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