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Star Life Cycles 1. A star generates energy by nuclear fusion reactions in its core. The color of a star is determined by its surface temperature . (Copy this diagram).

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Presentation Transcript
slide3

The color of a star is determined by its surface temperature.

(Copy this diagram)

slide4

Stars are classified by color and temperature. The most common system uses the letters O (blue), B(blue-white), A (white),

F (yellow-white), G (yellow),

K (orange), and M (red), from hottest to coolest.

slide5

Stars form from clouds of gas and dust called nebulas. Nebulas collapse until nuclear fusion starts.

slide7

Sun-like stars expand into red giants, and then fade out as white dwarf stars. (draw one of these diagrams)

slide8

Very massive stars expand into red supergiants, explode in supernovas and then end up as neutron stars or black holes.

(draw this diagram)

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