Dark energy
Black holes
Pulsars
Exoplanets
Variable stars
Types of galaxies
SETI
Supernovae
End of the universe
Olber's paradox
Cosmic background radiation
WMAP
Death of the dinosaurs
Pluto reclassification
Origin of life on earth (or elsewhere)
Trip to Mars
Possible life on the moons of Jupiter
Topic of your choosing ?
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