The Universe. although violent, is filled with creation events following destructive ones. 1850 light-years away, both types are unfolding.
All throughout the Universe, there are normally three ways that moons can form.
1.) A circumplanetary disk can fragment into moons, common around giant worlds.
2.) Interloping, low-mass bodies can be gravitationally captured.
3.) Or giant collisions can occur, kicking up debris that coalesces into moons.
That third way explains many lunar systems, including Earth’s, Mars’s, and even Pluto’s.
When a massive planetary collision occurs, a diffuse, puffed-up structure known as a synestia forms.
There can be so much debris that even the parent star’s light can be blocked.
These events should be common in young stellar systems, emitting long-lasting infrared afterglows.