megaparsec
noun
mega·par·sec
ˌme-gə-ˈpär-ˌsek 
: a unit of measure for distances in intergalactic space equal to one million parsecs
Examples of megaparsec in a Sentence
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Previous measurements of universal expansion were split between either 67 or 72 kilometers per second per megaparsec.
—
Nathaniel Scharping, Discover Magazine, 16 Oct. 2017
Planck mission scientists arrived at a Hubble constant of 67.5 plus or minus 0.5 kilometers per second per megaparsec.
—Ashley Strickland, CNN, 23 May 2022
Hubble’s data shows that the universe’s expansion rate is around 73 kilometers per second per megaparsec.
—Joshua Hawkins, BGR, 20 May 2022
In their analysis, H0 comes out to be 73.04 ± 1.04 kilometers per second per megaparsec.
—Anil Ananthaswamy, Scientific American, 18 Apr. 2022
Each number is an expression of the same thing—the kilometers-per-second rate of cosmic expansion per every megaparsec (roughly 3.26 million light-years) of space.
—Daniel Leonard, Scientific American, 25 Jan. 2022
The trend continued; as of their latest analysis last March, Riess’s team pegged the Hubble constant at 74 kilometers per second per megaparsec, 9% higher than the 67.4 extrapolated from the early universe.
—Quanta Magazine, 26 Feb. 2020
Under certain assumptions about the fundamental nature of the universe, Planck data suggest that the Hubble constant should have a value of 67.4 kilometers a second per megaparsec, give or take 0.5.
—Michael Greshko, National Geographic, 12 Sep. 2019
The Planck team predicts that the universe should expand at a rate of 67.4 kilometers per second per megaparsec.
—Quanta Magazine, 8 Aug. 2019
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Nathaniel Scharping, Discover Magazine, 16 Oct. 2017
Planck mission scientists arrived at a Hubble constant of 67.5 plus or minus 0.5 kilometers per second per megaparsec.
—Ashley Strickland, CNN, 23 May 2022
Hubble’s data shows that the universe’s expansion rate is around 73 kilometers per second per megaparsec.
—Joshua Hawkins, BGR, 20 May 2022
In their analysis, H0 comes out to be 73.04 ± 1.04 kilometers per second per megaparsec.
—Anil Ananthaswamy, Scientific American, 18 Apr. 2022
Each number is an expression of the same thing—the kilometers-per-second rate of cosmic expansion per every megaparsec (roughly 3.26 million light-years) of space.
—Daniel Leonard, Scientific American, 25 Jan. 2022
The trend continued; as of their latest analysis last March, Riess’s team pegged the Hubble constant at 74 kilometers per second per megaparsec, 9% higher than the 67.4 extrapolated from the early universe.
—Quanta Magazine, 26 Feb. 2020
Under certain assumptions about the fundamental nature of the universe, Planck data suggest that the Hubble constant should have a value of 67.4 kilometers a second per megaparsec, give or take 0.5.
—Michael Greshko, National Geographic, 12 Sep. 2019
The Planck team predicts that the universe should expand at a rate of 67.4 kilometers per second per megaparsec.
—Quanta Magazine, 8 Aug. 2019
Cite this Entry
“Megaparsec.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/megaparsec. Accessed 26 Jul. 2025.
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