Exam III
Physics 1302
1. How did our Sun form within a huge cloud of interstellar gas and dust?
a. A cloud fragmented into smaller objects, forming many stars at once.
b. One star formed; leftover matter formed into planets, moons, asteroids, & comets.
c. Clouds rotated & threw off mass until only enough was left to form one star.
d. Various clouds came together and collided, forming the star.
e. Our Sun did not form in a cloud of interstellar gas and dust.
2. A protostar has become a star once
a. it has begun to give off light.
b. planets have formed around it.
c. it is smaller than its Roche lobe.
d. nuclear fusion has begun.
e. no single criterion makes the difference.
3.Our Sun will shine for a total of about
a. 10 million years.
b. 100 million years.
c. 1 billion years.
d. 10 billion years.
e. 100 billion years.
4.Stars often form within groups known as
a. clans.
b. spiral waves.
c. aggregates.
d. clusters.
e swarms.
5. An object not quite massive enough to start nuclear fusion is a
a. brown dwarf
b. white dwarf.
c. black dwarf.
d. neutron star.
e. pulsar.
6.A star like the Sun begins to evolve away from the main-sequence when
a.The core begins fusing iron into heavier elements.
b. the star fuses carbon into heavier elements.
c. the carbon detonation explodes it as a type I supernova.
d. helium accumulates in the core and the star begins fusing that into carbon.
e. Hard to say; some Sun-like stars evolve off the main sequence while others don’t.
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