Transcript Star Life Cycle Review

Star Life Cycle Review
• Transports energy from the radiative zone to
the surface of the sun.
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Sunspot
Corona
Photosphere
Convective zone
• Convective zone
• The only layer of the sun that reflects visible
light.
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Sunspot
Corona
Photosphere
Solar flare
• photosphere
• Outermost layer of the sun that is hotter than
the surface of the sun and seen only during a
solar eclipse.
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Sunspot
Corona
Solar flare
Convective zone
• Corona
• Cooler areas located near the equator on the
surface of the sun
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Sunspot
Photosphere
Chromosphere
Solar flare
• sunspot
• Violent explosions of gas released from the
chromsphere and corona.
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Sunspot
Photosphere
Chromosphere
Solar flare
• Solar flare
• The spherical distance surrounding a black
hole out of which nothing can escape
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Accretion disk
Singularity
Event horizon
Escape velocity
• Event horizon
• A spiral of gas that can surround a black hole.
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Accretion disk
Singularity
Event horizon
Escape velocity
• Accretion disk
• The speed at which an object must travel to
escape the gravitational pull of anther object.
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Accretion disk
Singularity
Event horizon
Escape velocity
• Escape velocity
• The point at the center of a black hole
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Accretion disk
Singularity
Event horizon
Escape velocity
• singularity
• ____________ are caused by solar winds
interacting with the Earth’s magnetosphere at the
poles.
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Auroras
Northern lights
Southern lights
All of the above
None of the above
• All of the above
• The sun generates huge amount of energy
through nuclear ________.
• Fission
• Fusion
• fusion
• In the sun’s core __________ collide with
other ___________ to produce helium atoms.
• Protons
• Electrons
• Neutrons
• protons
• Suppose a star that is 500 light years away
from Earth exploded 500 years ago. When will
see the explosion?
• 500 years ago
• 500 years from now
• today
• today
• Of the following stars, the youngest are
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Main sequence stars
White dwarfs
Black dwarfs
Red giants
• Main sequence stars
• White dwarfs stars
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Form from red giants
Fuse hydrogen to carbon
Form from planetary nebulas
Form supernovas
• Form from planetary nebulas
• Nearly 90% of all stars are in what point of
their life cycle?
• Nebulas
• Protostars
• Main sequence stars
• White dwarfs
• Main sequence stars
• The sun is
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An unusually hot star
A very cool star
A typical star
None of the above
• A typical star
• The surface temperature of a star can be
estimated based on the star’s
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Size
Color
Age
Mass
• color
• All stars
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Reflect light from the sun
Appear to wander off their star paths
Produce their own light
All of the above
None of the above
• Produce their own light
• The solar wind pushes and shapes the Earth’s
____________.
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Magnetic Poles
Magnetosphere
Atmosphere
Weather patterns
• Magnetosphere
• The corona is hotter than the ___________ of
the sun.
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Core
Radiative zone
Convective zone
Photosphere (surface)
• Photosphere (surface)
• The sun is a medium sized star but looks very
bright to us because it is
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Very luminous
Very hot
Father away from us than other stars.
Closest to us
• Closest to us
• A red star is hotter than
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a blue star
A white star
All other stars
No other stars
• No other stars
• Most of the stars in the Milky Way will end
their lives as
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Blackholes
Neutron stars
White dwarfs
Main sequence stars
• White dwarfs
• A star is born when
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Gas and dust collapse inward
Nuclear fusion stars in the core
Fusion of the hydrogen slows down
The core becomes carbon and oxygen
• Nuclear fusion stars in the core
• Cooler stars glow with light that is less intense at
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Shorter wavelengths (toward the red end of the spectrum)
Shorter wavelengths (toward the blue end of the spectrum)
Longer wavelengths (toward the red end of the spectrum)
Longer wavelengths (toward the blue end of the spectrum)
• Longer wavelengths (toward the red end of
the spectrum)
• Stars radiate (give off)
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Heat
Electromagnetic waves
Light
All of the above
None of the above
• All of the above
• Galaxies contain interstellar matter. What is
interstellar matter?
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Gas and dust that may form new galaxies.
Gas and dust that may form new stars
Matter that may form new universes
Matter that may form new constellations
• Gas and dust that may form new stars