Stars form from massive clouds of dust and gas in space, Gravity pulls the dust and gas together,
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Formation of a star 2
As the gas falls together, it gets hot. A star forms when it is hot enough for nuclear reactions to start. This releases energy, and keeps the star hot.
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Formation of a star 3
During its 'main sequence' period of its life cycle, a star is stable because the forces in it are balanced. The outward pressure from the expanding hot gases is balanced by the force of the star’s gravity. Our Sun is at this stable phase in its life
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Formation of a star 4
Gravity pulls smaller amounts of dust and gas together, which form planets in orbit around the star.
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Stars the same size as the sun
Main sequence star → red giant → white dwarf → black dwarf
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Card 2
Front
Formation of a star 2
Back
As the gas falls together, it gets hot. A star forms when it is hot enough for nuclear reactions to start. This releases energy, and keeps the star hot.
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