Hubble constant
1
9.1
- noun
- /ˈhʌbəl ˈkɒnstənt/
- Specialized
:
constante de Hubble
- The key project will also determine the Hubble constant, which measures the expansion rate of the universe.
- measurement of the Hubble constant
And the rate at which the universe is expanding today is a quantity that we call the Hubble constant.
- And the rate at which the universe is expanding today is a quantity that we call the Hubble constant.
- This astronomer named Edwin Hubble, who's very famous for the Hubble constant, the Hubble Space Telescope, bears his name.
Examples
-
Reid's recalibration also bears directly on estimates of the Hubble constant and the age of the universe.
Academic text (1997) -
We astronomers will monitor its flickering year after year until it yields a firm, independent measurement of the Hubble constant.
Academic text (2003) -
How fast we're expanding is the Hubble constant.
Fiction book (2000) -
The Hubble constant proves this point.
Blog text (2) -
The most direct way to address the age of the universe is to measure H0, the Hubble constant.
Academic text (1997) -
"The latest, most accurate measurement of the Hubble constant depends on Type Ia supernova explosions.
Fiction book (2000) -
And so, based on the Hubble constant and other chosen cosmological parameters assumed by the theorists, such as homogeneous and isomorphic expansion, the great expansion was on.
Blog text (19) -
Such a lens, created by the interaction of a quasar and a galaxy perfectly aligned with Earth, would enable astronomers to deduce one of the holy grails of astronomy: the Hubble constant, or the expansion rate of the universe.
Academic text (2003) -
The goal was to come up with a value of the Hubble constant accurate to 10 percent.
-
For a number that's the focus of so much controversy, the Hubble constant is conceptually simple.
Synonyms
A number that shows how fast the universe is expanding now
A number that shows how fast the universe is expanding now
A number that shows how fast galaxies move apart depending on distance
Surface Forms
Morphology
The phrase is compositionally built from the proper name 'Hubble' (the astronomer/phenomenon associated with galaxy recession) and 'constant' (a fixed numerical value), so its meaning as the fixed value associated with Hubble's law is directly inferable. The pattern 'Name + constant' is cross-linguistically common, so a B1 learner who knows both constituents can grasp the general idea even if they lack the technical formula.
Etymology
Hubble constant is named after the scientist Edwin Hubble, who showed that far-away galaxies move away from us. The word constant was used because this single number links a galaxy's speed to its distance, so the phrase now means the number that tells 'how fast the universe is expanding'.