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28 Cards in this Set

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