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40 Cards in this Set
- Front
- Back
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We would need a telescope in space to observe stars using what type of electromagnetic radiation?
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X-Ray
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What region of the Electromagnetic spectrum would we use to look for objects in space that have temperatures of 300k?
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Infrared radiation (heat)
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Electromagnetic Radiation in order of decreasing wavelength
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radio, infrared, visible, UV, X-rays, gamma rays
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One capacity of a telescope that improves as we build bigger telescopes, regardless of the effects of the atmosphere is
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light gathering capability
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Compare red light to blue
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as an object heats up it will emit less red light, red light corresponds to lower energy radiation than blue light, red light has longer wavelength than blue light
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In the Bohr Model of the atom, light is emitted when
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an electron moves from a larger to a smaller orbit
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We use parallax to determine
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distance to a star
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If you know a stars apparent magnitude m, what do you need to know to determine its absolute magnitude M?
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Distance
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The absolute magnitude of a star is
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equal to the apparent magnitude of the star changes brightness
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Which of the following is not an electromagnetic wave? microwaves, radio waves, gamma rays, sound waves
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sound waves
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A star that is very luminous and cool must have
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a very large radius
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In the nuclear reactions in the center of the Sun, what can be said?
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Mass is lost during the reaction
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Which kind of Stars are the hottest
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O type
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Which of the main sequence star is most massive
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O type
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Which of the stars will spend the most time on the main sequence
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M type
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A planetary Nebula is?
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a shell of gas ejected from a star late in its life
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Binary Stars are useful for determining what property of stars
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Mass
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The core of the Sun, at the end of its time on the main sequence, will have acquired a large amount of
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helium
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The dominant component for all newly formed stars in our galaxy is
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Hydrogen
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If we could observe a newly formed star, we would be able to predict its future based on knowing which property?
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mass
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The expected time that a star like the Sun will spend on the main sequence
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10 billion years
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The Hertzsprung-Russell (HR) diagram is a statistical plot of
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luminosity against temperature
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A very cool, very large star will be found on the HR diagram at
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the upper right hand corner
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Brown Dwarfs are
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very low mass stars
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List the stages in our Suns life in correct order
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protostar in a bright nebula, main sequence, red giant, white dwarf
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A white dwarf generates energy by what mechanism?
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it doesn't generate energy, but simply cools
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When the Sun becomes a red giant, it will be as large as
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the orbit of Earth
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The mass of the white dwarf that the sun will form will be
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<1.0 solar masses
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Main Sequence stars generate energy by
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nuclear fusion
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When a stars spectrum is redshifted as a result of the Doppler Effect, we know that the star is
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moving away from the Earth
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Why do stars of larger mass live long on the main sequence than stars of lesser mass
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the massive stars use their fuel more rapidly
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Interfrometers allow astronomers to
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greatly increases resolution by combining several telescopes to work as one
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The largest refracting telescope in the world is located in
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Wisconsin
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This property of a wave measures the number of wave crests that pass a point per second, and is measured in hertz
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frequency
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types of Rock: Igneous
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solidified molten rock
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Types of rock: Sedimentary
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rock altered by wind or water
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Types of Rock: Metamorphic
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rock altered by pressure or temperature
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Types of rock: Primitive
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Unaltered by geological activity since the solar system formed
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Evidence of water on Mars
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runoff channels (ancient rivers)
outflow channels (permafrost melting) Lobate Craters(permafrost melting) present ice caps |
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nucleosynthesis
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stars generate energy by burning light elements to heavy elements
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