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