This image shows the formation of Jupiter in 3 stages.
Stage 1 / until 1 million years: Jupiter grows by
accretion of pebbles (blue dots). Large
primordial planetesimals (big red dots) show
high collision velocities (red arrows) leading to
destructive collisions (yellow) and producing
small, second generation planetesimals (small
Stage 2 / 1-3 million years: The energy resulting
from the accretion of small planetesimals
prevents rapid gas accumulation and thus rapid
growth (gray arrows).
Stage 3 / beyond 3 million years: Jupiter is
massive enough to accrete large amounts of