megaparsec
noun
mega·par·sec ˌme-gə-ˈpär-ˌsek 
: a unit of measure for distances in intergalactic space equal to one million parsecs
Example Sentences
Recent Examples on the Web 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 These ripples can be mapped and modeled to predict the expansion rate, which placed it at 67.4 kilometers per second per megaparsec. Ashley Strickland, CNN, 16 July 2019 See More
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 These ripples can be mapped and modeled to predict the expansion rate, which placed it at 67.4 kilometers per second per megaparsec. Ashley Strickland, CNN, 16 July 2019 See More Word History
Etymology
mega- + parsec
First Known Use
1920, in the meaning defined above