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A megaparsec is a measurement of distance equal to one million parsecs or 3.26 million light years. Megaparsec is usually abbreviated as Mpc.

That is at 4065th megaparsec we will reach terminal velocity of light. What happens in next 227 megaparsecs?
Is this when measured from Earth to the Object or is it measured from a central universal point to the object?

MEGAPARSEC (Mpc) - Distance measurement equal to one million parsecs or 3.26 million light years.

Megaparsec. One million parsecs, a distance equal to 3 260 000 light years.
Meridian. The imaginary line that passes from north to south horizons via the zenith.

A unit of distance equal to a million parsecs, or 3.2616 million light-years.
Meinel Bands ...

~ (Mpc): A unit of distance equal to 1 million pc.
metals: In astronomical usage, all atoms heavier than helium.
metastable level: An atomic energy level from which an electron takes a long time to decay; responsible for producing forbidden lines.

A ~ (Mpc) is a unit of distance that is equal to one million parsecs, 3.26 x 106 light-years or 3.085678 x1019 kilometers. The Local Group of galaxies is roughly a ~ in diameter.

[edit] ~s and gigaparsecs
A distance of one million parsecs (approximately 3,262,000 ly or 2-1019 miles) is commonly denoted by the ~ (Mpc). Astronomers typically measure the distances between neighboring galaxies and galaxy clusters in ~s.

~ (MPC)
Equals one million parsecs (3.26 million light-years) and is the unit of distance commonly used to measure the distance between galaxies.
Mercury ...

~ One million parsecs. See parsec. mel A unit of acoustic pitch. By definition, a simple tone of frequency 1000 cycles per second, 40 decibels above a listener's threshold, produces a pitch of 1000 mels.

Millions of floating-point operations per second. A computer benchmark. [McL97]
A unit of distance equal to a million parsecs, or 3.2616 million light-years. [C95]
Meinel Bands ...

The period-luminosity relation enables us to find distances out to 4 ~s (40 ~s with the Hubble Space Telescope).
Rung 5a: Galaxy Luminosity vs. Another Bright Feature ...

] Since both kilometers and ~s (1 Mpc = 3.086E24 cm [the "E24" means multiply the 3.086 by 10 to the 24th power]) are units of distance, the simplified units of Ho are 1/time, ...

The largest radio galaxies have lobes or plumes extending to ~ scales, implying a timescale for growth of the order of tens to hundreds of millions of years.

Astronomers have recognized and cataloged spiral, elliptical, and irregular galaxies as far away as several hundred ~s from Earth. Beyond this distance, galaxies appear so faint that it is difficult to discern their shapes. Consequently, their types are largely unknown.

When dealing with other galaxies or clusters of galaxies, the convenient unit is the ~ (1 ~ = 1,000,000 parsecs). The distance to the Andromeda Galaxy (Messier 31) is about 0.7 ~.

The exact value of the Hubble constant is still somewhat uncertain, but is generally believed to be around 65 kilometers per second for every ~ in distance. (A ~ is given by 1 Mpc = 3 x 106 light-years).

It's somewhere between 50 and 100 kilometers per second for every ~ in distance, km/sec/Mpc. This means that a galaxy 1 ~ away will be receding from us between 50 and 100 km/sec, while another galaxy 100 ~s away will be receding at 100 times this speed (bloody quick).

Literally overnight Sandage had expanded the Universe to unimaginable scales, just as Hubble has done before him, and this resulted in a more accurate assessment of Hubble's Constant, which is the measure of the expansion of the Universe, of 75 kilometres per second per ~ (today's best ...

Radio synthesis maps have shown jets in hundreds of AGN, on scales from subparsec to ~s. The continuity of jets in direction indicates that the central generator has a memory over millions of years, and disk structures provide a natural way to control the direction of the jets.

The Hubble constant had previously been found to be 72, give or take 8, kilometers per second per ~ based on Hubble Space Telescope observations.

The present expansion rate of the universe, symbolized by H and measured in units of km/s/Mpc or kilometers per second per ~. In 1929, Edwin Hubble discovered that the Doppler red shifts of other galaxies are directly proportional to their distances from the Milky Way.

What is the lookback time to a galaxy 100 ~s distant? Lookback time is the time that it has taken for light from a distant galaxy to reach us. A galaxy 100 Mpc away is 326 million light years away, so the Lookback time is 326 million years. (A parsec is about 3.26 lightyears.) ...

The Hubble constant is a critical number in the study of the universe. Its current most accurately measured value is 67.8 (km/s)/~, which means the expected speed of a galaxy at a distance of one ~ (about 3.26 million light years) is 67.8 km/s.

Using the HST they made 22 twenty-minute exposures of each of two fields in M 81containing the Cepheids. Once the data from these was reduced they were able to calculate a distance to M 81 of 3.4 ~s (about 11 million light years) compared to the previous range of values of 1.3 to 5.

If we look at Hubble's graph, we can say that a galaxy at 1000 Mpc is receding at 7000 km/s. By converting ~s into kilometres we can work out the age of the universe as 4.4 x 1017 s, about 14 000 million years. You can try it for yourself.
The age of the universe is given as: ...

NGC 7029 is a bright elliptical galaxy in Indus. It has an apparent visual magnitude of 11.7 and is about 36.3 ~s (118.4 million light years) distant. The galaxy was discovered by John Herschel in 1834.
Astronomy ...

Our galaxy is a member of the Local Group, and together with the Andromeda Galaxy dominates it; overall the Local Group contains about 30 galaxies in a space about ten ~s across. The Local Group is part of the Local Supercluster, also known as the Virgo Supercluster.
History ...

Hubble Constant (H): A measure of the rate of expansion of the Universe; current estimates are about 70 km/s/~.
Top of page ...

While the scale of our Galaxy is thousands of parsecs, or kiloparsecs (kpc), the scale of the distances between the galaxies is millions of parsecs, or ~s (Mpc). To measure the observable universe, we must expand our scale by another factor of one thousand to units of gigaparsec (Gpc).

There are probably more than 100 billion (1011) galaxies in the observable universe. Most galaxies are 1,000 to 100,000 parsecs in diameter and are usually separated by distances on the order of millions of parsecs or ~s.

We'll mostly stick to light-years in these pages, but you may see stellar distances in pc, distances in the Milky Way Galaxy in kiloparsecs (kpc), distances to other galaxies in ~s (Mpc) , and distances to very distant cosmological objects in gigaparsecs (Gpc).
1 parsec = 3.26 light-years ...

It is such a pain to write out all of those zeros that we'll just define a new unit of measure called the ~ (Mpc), which is a million parsecs. There is also the unit of a Megalightyear, which is obviously a million lightyears.

of a right triangle, whose short leg is one astronomical unit when the angle between the Sun and the Earth, as seen from an object in space (a star for example), is one arcsecond The word parsec stands for "parallax of one arc second" One kiloparsec (kpc), is one thousand parsecs. One ~ ...

See also: See also: What is the meaning of Astro, Galaxies, Galaxy, Astronomer, Parsec?

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