Related terms:
abell
distant
redshift
galaxies
survey
big bang
observer
milky way
dark matter
black hole
telescope
astrophysics
accretion disc
galaxy cluster
space telescope
gravitational
quantum gravity
general relativity
supermassive black hole
weak gravitational lensing
cosmic microwave background
Wikipedia sources:
Gravitational lens
Dark matter
Black hole
Quasar
Introduction to general relativity
Large-scale structure of the cosmos
Context for words:
gravitational
lensing
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