Concept
Planetesimal
A building block of planets.
Kilometre-sized bodies that grow by mutual collisions inside a protoplanetary disc, eventually assembling into protoplanets.
Overview
Kilometre-sized bodies that grow by mutual collisions inside a protoplanetary disc, eventually assembling into protoplanets.
See also
The Big Bang
How everything began, 13.8 billion years ago.
Black Holes
Regions where gravity stops light itself.
Dark Matter
The invisible mass holding galaxies together.
Dark Energy
The mysterious force accelerating the universe.
Light-Year & Astronomical Distances
Measuring the unimaginable.
Gravity
The force that shapes the universe.