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Table of Contents
The vacuum
Asteroids and comets
Solar flares and coronal mass ejections
Cosmic rays
Stellar nurseries
Stellar-mass black holes
Planetary nebulae
White dwarves and novae
Supernovae
Neutron stars and magnetars
Supermassive black holes
Quasars and blazars
Cosmic strings and miscellaneous spacetime defects
Dark matter
Hostile aliens
Wormholes
A final warning.
Asteroids and comets
Solar flares and coronal mass ejections
Cosmic rays
Stellar nurseries
Stellar-mass black holes
Planetary nebulae
White dwarves and novae
Supernovae
Neutron stars and magnetars
Supermassive black holes
Quasars and blazars
Cosmic strings and miscellaneous spacetime defects
Dark matter
Hostile aliens
Wormholes
A final warning.