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28 Cards in this Set
- Front
- Back
- 3rd side (hint)
Three ways of getting information from stars?
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magnitude, spectra, position NOT: autograph
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Pulsars are
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the same as neuron stars
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The factor that determines the length of a star's main sequence lifetime is the stars
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mass
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ass
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If the Universe is open
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it will expand forever ans we represent its surface as saddle-shaped
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The three types of variable stars are
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Cephides, RR Lyrae, and Mira
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To observe spectroscopic binaries, we rely on
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the Doppler effect
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weather
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A regular "wobble" in the path of a star is evidence that
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it has a companion rotating around it
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The contraction of an interstellar cloud to become a star is caused by
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gravitational forces
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how the tides work
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Which of the following are newly forming stars
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protostars
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Our galaxy is part of
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the Local Group
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sounds like a band
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The Sun will at some time in the future become
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red giant, white dwarf, black dwarf
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red white and black (snow white)
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According to the H-R Diagram stars in the upper portion have to be
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young
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opposite of old
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The apparent magnitude is
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how bright a star is anywhere
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The main sequence life of a star ends when
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hydrogen fusion stops in the core
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What causes a star to swell up as a red giant?
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increased energy produced within it
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Which of the following lists the stages in a star's life in correct order?
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protostar, main sequence, red giant, white dwarf
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A magnitude change of "1" corresponds to the brightness change of about 2.5 times. A magnitude change of "2" corresponds to brightness change of about
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6.3 times
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What goes on inside a star?
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nuclear reactions, hydrostatic equilibrium, mass being converted to energy
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When a star's 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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As a star changes from a main sequence star to become a red giant
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it gets larger and cooler
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The Hubble law is a relationship between galaxies
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redshifts and distances
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Which of the following type of star is the hottest?
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B type
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second letter of the alphabet
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If the temperature of a star increased without a change in the star's size, its point on the H-R diagram would move
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up and to the left
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When more material falls into a white dwarf, its size
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decreases
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Which of the following lists the stages in the life of the least massive stars after they leave the main sequence? (flyweights)`
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black dwarf
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On the main sequence, hot stars are generally___ than cool ones
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more massive and shorter lived
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a huge man that dies young
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A neutron star is formed when
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protons convert to neutrons because they are too densely packed together
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An ex. of a long term need in space flight is
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oxygen, exercise, water
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