Related terms:
hubble
distant
redshift
metric
galaxies
placebo
expanding
signals
study
telescope
relativity
expansion
universe
expanding universe
coordinate system
special relativity
general relativity
randomized controlled trial
united states
Wikipedia sources:
Frame of reference
Sputnik 1
Observational learning
Clinical trial
Metric expansion of space
SETI@home
Current sea level rise
Edwin Hubble
Metformin
Lazarus taxon
Mughal Empire
Longitudinal study
Context for words:
observational
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