megaparsec


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megaparsec

[‚meg·ə′pär‚sek]
(astronomy)
A unit equal to 1,000,000 parsecs.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The Baryon Oscillation Spectroscopic Survey also reported that the universe is expanding at 67 km/s per megaparsec, with an error of 1.5 percent, in a paper posted online at arXiv.org on July 11.
If that's less than 3.26 million light-years, then we'll stick with megaparsec as the record-holder.
As a result, the team said it measured Hubble's constant at 70 kilometers per second per megaparsec (a megaparsec is 3.26 million light years), with an uncertainty of 10%.
They suggested that every megaparsec, or 3.26 million light years, the universe's expansion rate accelerated by between 50 and 100 kilometres per second.
Those that have been mrgd or acqrd twice will not be allowed to enter the market for a full megaparsec or until Halleys comet passes, whichever occurs first."
Planck's value for the Hubble constant--which quantifies the current rate of cosmic expansion--holds steady in the new results at 67.3 kilometers per second per megaparsec. This value has been at odds with a slightly higher number obtained through observations of supernovas (SN: 4/5/14, p.
Those using the cosmic microwave background favor a value of about 67 kilometers per second per megaparsec (km/s/Mpc, where a megaparsec is 3.26 million light-years).
Initially, scientists had pegged the value of the Hubble Constant - a unit that is used to measure the rate of universe's expansion and is named after the astronomer Edwin Hubble - at roughly 43.7 miles per second per megaparsec (one megaparsec = 3.26 million light-years).
The newly refined value for the Hubble constant is 74.3 plus or minus 2.1 kilometers per second per megaparsec. A megaparsec is roughly 3 million light-years.
The improved value of the Hubble Constant now stands at 45.5 miles per second per megaparsec (one megaparsec = 3.26 million light-years), up from the previous value of roughly 43.7 miles per second per megaparsec.
* According to the astronomical observations, spectral lines of distant galaxies and quasars are redshifted as if these objects scatter with the radial velocity u = [H.sub.0] d, which increases 72 km/sec per each megaparsec of the distance dto the object.
The units for the universe's expansion rate, kilometers per second per megaparsec (km/s/ Mpc) can be confusing.