megaparsec
Lengthexact by definition
A megaparsec is one million parsecs, about 3.086 × 10²² metres or 3.26 million light-years. It is the unit of extragalactic distance: the Andromeda galaxy is 0.78 Mpc away, the Virgo cluster about 16.5 Mpc, and the Hubble constant is quoted in kilometres per second per megaparsec.
Watch out: The Hubble constant's units, km/s/Mpc, hide a pure reciprocal time. Converting the megaparsec to kilometres turns H₀ ≈ 70 into about 2.3 × 10⁻¹⁸ s⁻¹, whose inverse is the Hubble time of roughly 14 billion years.
| 1 | 3.0856776e+22 |
One megaparsec in every length unit
| 1.90915e+57 | Planck length (lP) | |
| 3.08568e+37 | femtometer (fm) | |
| 3.08568e+34 | picometer (pm) | |
| 5.83109e+32 | bohr radius (a0) | |
| 3.08568e+32 | angstrom (Å) | |
| 3.08568e+31 | nanometer (nm) | |
| 3.08568e+28 | micrometer (μm) | |
| 1.21483e+27 | thou (thou) | |
| 8.74680e+25 | point (pt) | |
| 3.08568e+25 | millimeter (mm) | |
| 7.28900e+24 | pica (pc) | |
| 3.08568e+24 | centimeter (cm) | |
| 1.21483e+24 | inch (in) | |
| 3.08568e+23 | decimeter (dm) | |
| 3.03708e+23 | hand (hh) | |
| 1.53388e+23 | link (li) | |
| 1.01236e+23 | foot (ft) | |
| 1.01236e+23 | US survey foot (ftUS) | |
| 3.37454e+22 | yard (yd) | |
| 3.08568e+22 | meter (m) | |
| 1.68727e+22 | fathom (ftm) | |
| 6.13552e+21 | rod (rd) | |
| 1.53388e+21 | chain (ch) | |
| 1.66613e+20 | cable length (cb) | |
| 1.53388e+20 | furlong (fur) | |
| 3.08568e+19 | kilometer (km) | |
| 1.91735e+19 | mile (mi) | |
| 1.66613e+19 | nautical mile (nmi) | |
| 6.39117e+18 | league (lea) | |
| 3.08568e+16 | megameter (Mm) | |
| 4.84332e+15 | Earth radius (REarth) | |
| 102,927,000,000,000 | light-second (ls) | |
| 80,272,800,000,000 | lunar distance (LD) | |
| 44,353,600,000,000 | solar radius (Rsun) | |
| 1,715,450,000,000 | light-minute (lmin) | |
| 206,265,000,000 | astronomical unit (AU) | |
| 3,261,560 | light-year (ly) | |
| 1,000,000 | parsec (pc) | |
| 1,000 | kiloparsec (kpc) | |
| 1 | megaparsec (Mpc)this unit | |
| 0.001 | gigaparsec (Gpc) |
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