Earth & Mars Jupiter & Saturn Mars & Jupiter Saturn & Uranus
4.2 light years 12.5 light years 6.1 light years 50.3 light years
200 million km 150 million km 90 million km 120 million km
Black Hole White Dwarf Quasar Pulsar
Exoalienology Alienology Exobiology Bioalienology
Supermassive black holes Massive supernovae Young supermassive galaxies The limit of the known universe
Exoplanetary bodies Extrasolar planets Exosolar planets Exo-orbitals
Singularity Event Horizon Trapped Surface Schwarzschild Radius
International Space Station Mir Skylab Apollo-Soyuz Test Project
Proton Zenit Energiya Buran