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Q 1/7
Score 0
Which statement about stars is correct?
60
main-sequence stars are formed by comets
Star formation begins in a nebula
white dwards become main-sequence stars when they gain mass
supergiants are stars that can absorb black holes
Q 2/7
Score 0
A star that is several thousand times brighter than the sun with a temperature lower than 4,000 K would be classified as -
120
a white dwarf in spectral class B
a supergiant in spectral class K
a main sequence star in spectral class K or M
a main-sequence star in spectral class B
7 questions
Q.
Which statement about stars is correct?
1
60 sec
Q.
A star that is several thousand times brighter than the sun with a temperature lower than 4,000 K would be classified as -
2
120 sec
Q.
The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?
3
60 sec
Q.
A student learns that the sun is classified as a medium-size star and that many stars are much bigger and brighter. However, the student observes that other stars look very dim, even through a telescope. Why do other stars look much dimmer than the sun?