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Properties of Stars: Mass (41)
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Stars & Mass
• Mass: How much matter is in an object.• Main evidence for star mass is its gravity. • Gravitational effects can be observed on other
objects and be used to determine a star’s mass.
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Matter & Gravity• All matter produces
gravity.• Gravitational force
depends on mass and how close the object is.– More mass = more
gravity.– Less distance between
objects = more gravity.
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Einstein and Gravity
• Space and time are the same thing– Serves as the “fabric of the universe”.
• Gravity is the curving of space-time created by an object’s mass.
• Objects with greater curves will cause objects with less mass/curve to fall toward it.
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• Quantum physics indicates a theoretical particle (graviton) that controls gravity.
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Mass & Star Families
Main sequence stars: •Larger stars are hotter. •Mass-luminosity relationship – massive are more luminous.
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Mass & Star Families (cont.)
Giants and supergiants:•Greatly vary in size•Have little mass for their size (.001-.00001 g/cm3).
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Mass & Star Families (cont.)White dwarfs: ½ to 1 solar mass.•Very high density because they have a mass equal to the sun but are the size of the earth. •Teaspoon of white dwarf material: 15 tons on earth.
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Mass & Star Families (cont.)
• Most common stars are red and white dwarfs– Dim stars because they are so small.
• Large stars are very rare, but are easier to see because they are so bright.
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Mass Super Hero (40)
• Design a comic book hero or villain based on a science concept we just discussed.
• The superpower must relate to the science concept.
• Draw an illustration showing the hero/villain using their superpower.
• Write 4-6 sentences explaining how the illustration and superpower relate to the concept.