ASTR 102 exam 2 2024| Questions with 100% Solutions| A Rated
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Course
ASTR 102
Institution
ASTR 102
When the sun becomes a red giant its luminosity will be _____________ times what it is now -
2000
When a star first moves off the HR diagram, its radius _________________ and its surface temperature
____________________ - increases, decreases
If a white dwarf is able to gain enough mass to exce...
ASTR 102 exam 2 2024| Questions
with 100% Solutions| A Rated
When the sun becomes a red giant its luminosity will be _____________ times what it is now -
✔✔2000
When a star first moves off the HR diagram, its radius _________________ and its surface temperature
____________________ - ✔✔increases, decreases
If a white dwarf is able to gain enough mass to exceed ____ solar masses, its self-gravity will be stronger
than electron degeneracy pressure, and the star will collapse. As it does so, its temperature increases to
the point that ______________ can undergo nuclear fusion, and the entire star ignites as a giant bomb. -
✔✔1.4, Carbon
A Type 1a Supernova consumes its _________ ___________ completely - ✔✔white dwarf
Which elements are produced only in a supernova? - ✔✔Silver, Gold, and Copper
If a neutron star is more than 2.8 times the mass of the sun, it will become a ___________ __________ -
✔✔black hole
The surface around a black hole where the escape velocity is the speed of light is called the _________
______________. - ✔✔event horizon
It takes a stellar core at least 3 times the mass of the sun to overcome _______________
____________________ pressure - ✔✔neutron degeneracy
If the sun became a black hole... - ✔✔nothing would happen
The black hole at the center of the Milky Way is about ____ _____________ times the sun's mass -
✔✔4.3 million
, A ____________________ _______ is a distribution of matter (such as a cluster of galaxies) between a
distant light source and an observer, that is capable of bending the light from the source as the
light travels towards the observer. - ✔✔gravitational lens
A large compact spherical star cluster, typically of old stars in the outer regions of a galaxy -
✔✔globular cluster
________ stars make up a globular cluster - ✔✔Halo
A ________________ spiral is a spiral galaxy with poorly defined spiral arms. - ✔✔flocculent
A ____________ spiral is a spiral galaxy with a central rectangular bar. - ✔✔barred
Hubble's galaxy classification was made well _____________ the HUDF was taken - ✔✔before
Most ______________ stars exhibit a halo of low-density, high-temperature gas. - ✔✔elliptical
The Chandra space telescope shows that the extended ___________ of an elliptical are filled with gas as
hot as 107 K. The presence of these hot halos indicate a violent past - ✔✔halos
Most of our galaxy's bright stars reside in the ________ - ✔✔disk
The matter and radiation that exists in the space between the star systems in a galaxy -
✔✔Interstellar medium
___________________ _______________ occurs when light from a star is scattered by the interstellar
medium - ✔✔Interstellar extinction
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