Megaparsecs to Inches (Mpc to in)

1 megaparsec equals 1.214833694×10²⁴ inches (rounded).

1 megaparsec = 1.214833694×10²⁴ inches

How to convert megaparsecs to inches

To convert megaparsecs to inches, multiply the number of megaparsecs by 1.214833694×10²⁴. The factor is rounded to 10 significant digits. To go the other way, multiply inches by 8.231579395×10⁻²⁵ (rounded).

inches = megaparsecs × 1.214833694×10²⁴

Example: 10 megaparsecs = 1.214833694×10²⁵ inches.

About these units

Megaparsec (Mpc)

AstronomicalCurrent unit

One million parsecs (about 3.26 million light-years). Used for distances between galaxies.

Galaxies are too far apart for the parsec to be comfortable, so astronomers multiply it by a million. A megaparsec, symbol Mpc, is 1,000,000 parsecs, or roughly 3.26 million light-years and about 3.09 times ten to the twenty-second power meters. It has no article of its own on Wikipedia and is treated as one of the parsec's multiples, alongside the kiloparsec for distances inside a galaxy and the gigaparsec for the largest cosmic structures.

Neighboring galaxies sit at a fraction of a megaparsec: the Andromeda Galaxy is about 0.78 Mpc away, while the Virgo Cluster lies near 16.5 Mpc. Cosmologists also use the unit inside the Hubble constant, quoted in kilometers per second per megaparsec, which expresses how fast distant galaxies recede for each megaparsec of separation. The Milky Way itself is roughly 34 kiloparsecs across, a useful reminder of how much larger intergalactic distances are.

1 megaparsec = 3.085677581×10²² meters (approximately).

Sources: Wikipedia: Parsec; Wikipedia: Megaparsec (redirects to Parsec)

Inch (in)

US & ImperialCurrent unit

1/12 of a foot. Defined as exactly 25.4 millimeters since 1959, when the US and Commonwealth countries agreed a common international inch.

Latin uncia, meaning one-twelfth, is the root of both inch and ounce, and it passed into Old English as ynce. Roman measurers divided their foot into twelve unciae, and the English inch kept that twelfth. After 1066 an inch was reckoned as three barleycorns, and a 1324 statute attributed to Edward II spelled out the definition as three grains of barley, dry and round, placed end to end lengthwise. For centuries the inch was simply a twelfth of a foot, or a thirty-sixth of a yard, and the US and UK each kept their own copy of the standard yard.

Those copies differed slightly until the 1959 international agreement fixed the yard at exactly 0.9144 meter, which made the inch exactly 25.4 millimeters. The US adopted it in 1959 and the UK ratified it in 1963, effective 1964. Today the inch is still the customary unit in the United States and Canada, and the UK keeps it on road signs. Worldwide it also names display diagonals, wheel rims, tire codes and pipe sizes.

1 inch = 0.0254 meters (exactly).

Sources: Wikipedia: Inch; Wikipedia: Yard; NIST Guide to the SI, Appendix B.8: conversion factors

Related conversions

See all length units.