Steep density drop-offs and orbits with high inclinations and eccentricities are just a few of the mysterious features in the outer reaches of our Solar System – can a single stellar fly-by help explain all of them?
Astronomers have long believed the Moon formed from a giant impact. Are multiple medium-sized impacts a better explanation?
The Rosetta orbiter sent back lots of mystifying data from its time spent following the comet 67P/C-G. Today we focus on just one of its discoveries: molecular oxygen in the comet’s coma.
We dive back into one of the earliest studies of the outer solar system that helped us understand how four gas giants playing a chaotic game of catch could have knocked Pluto into its topsy-turvy orbit.
While a planet is forming, its passage through the protoplanetary disk can prevent pebbles from migrating inwards and accreting onto the planet.
Comet D/Lexell has been lost to memory since its discovery in 1770. Can modern astronomical methods track it down?