Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy a
number the expresses therate ofexpansion of theuniverse ; thevelocity at which a distant object isreceding from theEarth divided by itsdistance ; itsreciprocal gives theage of the universe
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
After Edwin Powell Hubble, American astronomer
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