Created by Stephen Kerns
almost 9 years ago
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Astronomy
Atom
Cephid
Collective Learning
Cosmic Background Radiation
Doppler effect
Energy
Evidence
Gravity
Light-Year
Matter
Nucleus
Parallax
Redshift
Scientific method
Telescope
Electromagnetism
Electron
Helium
Hydrogen
Inflation
Newtron
Nucleus 2
Proton
Spacetime
Speed of light
Thermodynamics (the first law of)