Megaparsec

megaparsec (Mpc) A unit of distance equal to one million parsec. Milky Way Galaxy ...

Megaparsec (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 ...

megaparsec one million parsecs; equal to 3.26 million light-years meridian ...

MEGAPARSEC A megaparsec (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 megaparsec in diameter.

megaparsec -- a distance unit equal to 1million parsecs and abbreviated Mpc. metal -- astronomically, any chemical element more massive than helium. Thus carbon, oxygen, iron, and so forth are metals.

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

[edit] Megaparsecs and gigaparsecs A distance of one million parsecs (approximately 3,262,000 ly or 2Ã-1019 miles) is commonly denoted by the megaparsec (Mpc).

megaparsec 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.

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

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

Hubble Constant The present expansion rate of the universe, symbolized by H and measured in units of km/s/Mpc or kilometers per second per megaparsec.

The present value lies between 46 and 57 mi (57 and 73 km) per second per megaparsec. There is still a significant factor of uncertainty in the value of this constant, although the difference is just half of what is was in 1990.

The Milky Way galaxy is a member of an association named the Local Group, a relatively small group of galaxies that has a diameter of approximately one megaparsec.

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

The standard CDM model that emerged in the mid-1980s served a very useful purpose because it established that the underlying cosmology was a flat Friedmann model with a Hubble constant of 50 kilometres per second per megaparsec, ...

Hubble's first determination of it was a value of 550 kilometers per second for every megaparsec in distance (km/sec/Mpc). Today, it is generally believed to be around 65 km/sec/Mpc. (A megaparsec is given by 1 Mpc = 3 x 106 light-years).

It's somewhere between 50 and 100 kilometers per second for every megaparsec in distance, km/sec/Mpc.

5 megaparsecs (just under 5 million light-years). Abell classified such clusters as regular and irregular, and ranked them on six-point scales according to both their richness (population density) and distance (1 to 6, for closest to furthest).

Radio synthesis maps have shown jets in hundreds of AGN, on scales from subparsec to megaparsecs.

Having an absolute distance means we know the value of d in inches or meters or something - astronomers use a unit called the megaparsec (Mpc), where 1 Mpc = 3.1 x 1022 m.

What is the lookback time to a galaxy 100 Megaparsecs 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.

or Hubble's law; it states that the recession velocity of a galaxy is proportional to its distance. The ratio of the recession velocity of a galaxy to its distance (the Hubble constant) is now estimated to be between 50 and 100 km/sec per megaparsec ...

Extended sheet of galaxies measuring at least 200 megaparsec across; one of the largest known structures in the Universe. greatest eastern elongation The configuration of an inferior planet at its greatest angular distance east of the Sun.

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 megaparsecs across.

A number that expresses the rate at which the universe expands with time. Ho appears to be between 60 and 75 kilometers per second per megaparsec. Hubble Space Telescope (HST) ...

Hubble Constant (H): A measure of the rate of expansion of the Universe; current estimates are about 70 km/s/megaparsec. I 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 megaparsecs (Mpc).

High-energy cosmic rays, in the form of fast-moving protons and atomic nuclei, are not able to travel more than about 100 megaparsecs due to the GZK cutoff. Neutrinos can travel this distance, and greater distances, with very little attenuation.

us (v) due to the overall expansion of the universe. The relation is v = Ho R where Ho is the constant of proportionality known as Hubble's constant. The present "best" value of the Hubble constant is about 70 kilometers per second per Megaparsec.

See also: Distance, Galaxies, Galaxy, Universe, Light