Concept
Hubble Flow
The general expansion-driven motion of galaxies.
The average recession of galaxies from one another due to cosmic expansion, separated from their peculiar motions.
Overview
The average recession of galaxies from one another due to cosmic expansion, separated from their peculiar motions.
See also
Lagrange Points
Five spots where gravity and orbital motion balance.
Moving Group
Stars sharing a common motion through the galaxy.
Doppler Effect
Frequency shift due to relative motion.
The Big Bang
How everything began, 13.8 billion years ago.
Black Holes
Regions where gravity stops light itself.
Dark Matter
The invisible mass holding galaxies together.