Questions and Answers
What causes stars to form?
Gravity pulling gas and dust particles together
How are stars classified?
By their color, temperature, brightness, and size
Which color of a star indicates the hottest temperature?
Blue
How does a star release energy as heat and light?
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What can the size of a star tell us about its brightness?
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Study Notes
Star Formation
- Gravity causes gas and dust particles in space to come together, forming a star
- Particles are squeezed together under great pressure, releasing energy as heat and light
Star Classification
- Stars are classified by color, temperature, brightness, and size
- Color is an indicator of a star's temperature
- Blue stars are the hottest, with an average temperature of about 15,000 ºC
Star Sizes
- Stars come in a wide range of sizes
- White dwarf stars can be as small as a planet
- Giant and supergiant stars are many times bigger than the average-size star
Star Brightness
- A star's brightness is related to the amount of visible light it gives off
- The largest stars are usually the brightest
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