The Local Group of galaxies is dominated by the presence of spiral galaxies
a. True
b. False
Indicate whether the statement is true or false
False
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Cold dust disks are _____________ disks around main-sequence stars, the dust of which is created by collisions among the planetesimals
Fill in the blank(s) with correct word
What would happen if more mass was added to a 1.4 solar mass neutron star?
A) It would erupt as a Type I supernova. B) It could eventually become a black hole, via a hypernova explosion. C) It would grow larger, temporarily becoming a red giant again. D) All of its protons and electrons would turn into quarks. E) It would blow off mass as a gamma ray burster.
A charge of 1.0 × 10-6 ?C is located inside a sphere, 1.25 cm from its center. What is the electric flux through the sphere due to this charge? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 0.028? N ? m2/C B) 0.11 N ? m2/C C) 8.9 N ? m2/C D) It cannot be determined without knowing the radius of the sphere.
The event in the life of a star that begins its expansion into a giant is
A) the core reaches a temperature of ten million degrees B) as much as 90% of the star explodes violently C) almost all the hydrogen in its core that was hot enough for fusion has been turned into helium D) the star's internal structure reaches equilibrium for the first time in its life E) it reaches the stage that astronomers call the zero-age main sequence