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Of the three ways in which energy is transferred in nature (radiation, conduction, and convection) which two are important to the sun?
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Radiation and Convection
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Parallax is the
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Apparent shift in the position of a nearby object as we move.
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What process provides the power for the sun?
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Fusion of hydrogen into helium.
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Granulation on the surface of the Sun in caused by
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Convective currents carrying heat from beneath the surface.
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The nuetrino is
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An elusive, subatomic particle having little or no mass and very difficult to detect.
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What is the characteristic color of an emission nebula?
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Red.
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Astronomers measure the masses of stars by
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Observing the motion of two stars in a binary star system.
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A brown dwarf is
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An object intermediate between a planet and a star, with not enough mass to begin nuclear reaction in its core.
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The evolution of a star is controlled mostly by its
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Initial mass
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The spectral sequence of star surface temperature as determined by relative spectral line strengths has been given which sequence of letters, in order of decreasing temperature?
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OBAFGKM
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If stellar parallax can be measured to a precision of about 0.01 arcsec using a telescope on Earth to observe stars, to what distance does this correspond in space?
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100 pc
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What is a positron?
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A positive electron.
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The phrase "hydrostatic equilibrium" in the sun refers to:
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The balance of gravity inward and gas pressure outward.
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The Hertzsprung-Russell diagram is a statistical plot of which stellar parameters?
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Luminosity and Surface temperature
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An arching column of gas suspended over a sunspot group is called
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A prominence
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