An abridged inventory of everything there is in the universe – from rogue planets and exomoons to supernovae, supermassive black holes and the cosmic web.
If a star flying past our solar system moved Neptune's orbit by just 0.1 per cent, it could eventually cause the other planets to smash into one another or get thrown out of the solar system entirely
Worlds that hold onto their dense primordial atmospheres of hydrogen and helium may stay warm enough to maintain liquid water on their surfaces, even without starlight
