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special-relativity × 40space-time × 11
general-relativity × 10
light × 7
black-hole × 5
time-dilation × 4
gravity × 3
cosmology × 3
redshift × 3
speed × 3
galaxy × 2
universe × 2
observable-universe × 2
velocity × 2
exoplanet × 1
space × 1
big-bang-theory × 1
expansion × 1
gravitational-waves × 1
spectroscopy × 1
mass × 1
neutron-star × 1
cosmological-inflation × 1
n-body-simulations × 1
gas × 1
