neutron stars
variable stars
SETI
Drake equation
Supernovae
Galaxy types
end of the universe
Olber's paradox
dark matter
dark energy
origin of the Moon
life on Earth?
Exoplanets
wormholes
relativity / twin paradox
general relativity
NASA
moon landing
radio waves from space - radio astronomy (K. Jansky)
WMAP
inflation (Adam Riess)
James Webb
Hubble (legacy / telescope)
astronaut training
planet colonizing
Mars One
entropy? (2nd law of thermodynamics)
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