Question

question 10 (1 point)
all large galaxies are believed to have at their hearts a supermassive black hole, sporting a mass between millions and billions of times that of the sun.
but not all of these black holes power quasars, the _?_ source of light in the cosmos.
brightest
dimmest

question 11 (1 point)
for a formation of a star like the sun, the life cycle would go like this: _?_
white dwarf, nebula, main sequence star, protostar, red giant
red giant, protostar, white dwarf, main sequence star, nebula
protostar, red giant, main sequence star, nebula, white dwarf
nebula, protostar, main sequence star, red giant, white dwarf

question 12 (1 point)
about _?_ of the stars are binary stars, two stars that orbit each other, bound together by gravity.
1/3
1/2
2/3
100%

Explanation:

Question 10

Quasars are extremely luminous objects. They are powered by accretion disks around supermassive black holes. Among cosmic light - emitting sources, quasars are the brightest.

A star like the Sun forms from a nebula (a cloud of gas and dust). The nebula collapses to form a protostar. Then it becomes a main - sequence star (where it spends most of its life). As it ages, it expands into a red giant. Finally, it sheds its outer layers and leaves behind a white dwarf.

It is estimated that about two - thirds of the stars are binary stars. This is based on astronomical observations and studies of stellar populations.

Answer:

a. brightest

Question 11