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MT ASTRO 1504 EXAM QUESTIONS AND ANSWERS
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MT ASTRO 1504 EXAM QUESTIONS ANDANSWERS
The density of a neutron star is: - ANSWER about the same as an atomic nucleus.
The of a black hole is the radius from a black hole at which the escape velocity is
approximately equal to the speed of light. - ANSWER Schwarzschild radius
The Collapsar model explains: - ANSWER The formation of some gamma-ray
bursters
For Cepheids the period-luminosity relation allows us to determine: - ANSWER
Stellar distances
In the "unified model of AGN" the difference between Seyfert I and Seyfert II
galaxies is due to: - ANSWER different viewing angles
The evidence for "dark matter" in the Milky Way and other galaxies comes from: -
ANSWER galactic rotation curves
Stars tend to pulsate as they age because they pass through which region of the HR
diagram? - ANSWER Instability strip
Astronomers recently measured the period of a star orbiting the center of our
galaxy and concluded: - ANSWER The star is orbiting a 3 million solar mass black
hole
A likely explanation for the preponderance of elliptical galaxies in rich clusters is: -
ANSWER Ellipticals are produced by the collisions of spirals
When galaxies collide: - ANSWER generally no stars will hit each other
The measurement of X-rays from clusters of galaxies strengthens our belief in: -
ANSWER Dark Matter
, The two largest galaxies in the Local Group are: - ANSWER the Galaxy (Milky
Way) and M31 (Andromeda)
The broad emission lines in active galactic nuclei are produced by: - ANSWER
rapidly moving gas clouds
The enormous amount of energy in QSOs probably arises from: - ANSWER
gravity
Who first determined that the brightness of Cepheid variable stars is larger when
the variation of their period is longer? - ANSWER Henrietta Leavitt
From our studies of galactic rotation curves and galaxy clusters we know that most
of the matter in the universe is: - ANSWER Dark Matter
We use the Period-Luminosity relation to find distances to which variable stars? -
ANSWER Cepheid Variables
The heavy elements in our bodies were formed: - ANSWER in the interiors of stars
21-cm radiation is produced by: - ANSWER cold hydrogen gas
The central engines of quasars are thought to be: - ANSWER accretion onto a
supermassive black hole
To be a spiral galaxy, a galaxy must have: - ANSWER A disk
The most massive nucleus that can be produced in normal stellar fusion is: -
ANSWER iron
A pulsar is believed to be: - ANSWER a rotating neutron star
Observationally, gamma-ray bursts have been associated with: - ANSWER
supernovae
The bending of light rays around the sun is explained by: - ANSWER Einstein's
theory of general relativity
. For a star cluster, the position of the "main sequence turnoff" tells us: - ANSWER
The cluster age
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