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STAR
A
IS
BORN
Large clouds of dust and gas—called
nebulae—lurk between the stars
throughout our galaxy. Stars and planets
form when the material in these clouds
compresses and clumps together.
It takes a few million years for enough
dust and gas to crowd together, heat up,
and begin revolving in a swirling mass.
The center grows denser and denser until
there is enough hydrogen and helium to
trigger nuclear fusion, and a star is born.