About 90 percent of the stars in space are ____ stars.
a. nebula
b. giant
c. main sequence
d. white dwarf
c. main sequence
100
The hottest stars in space are ____ in color.
a. yellow
b. red
c. blue
d. white
c. blue
100
A group of stars, gas, and dust held together by gravity is a ____.
galaxy
100
A star formed when Sun-sized stars use up their fuel
What is a red giant
200
The sun is in the main sequence of the Hertzsprung-Russell diagram
True
200
Its ____ makes Sirius the brightest star in the night sky.
a. apparent magnitude
b. parallax
c. color
d. absolute magnitude
a. apparent magnitude
200
A main sequence star becomes a ____ after it uses up the hydrogen in its core.
a. nebula
b. supernova
c. black hole
d. giant
d. giant
200
A ____ is a region so dense that nothing, including light, can escape its gravity field.
black hole
200
the theory that the universe began 14 billion years ago as a tiny point that expanded at great
What is the big bang theory
300
A telescope is a scientific instrument used to study the light that comes from stars.
False
300
The Sun produces energy by fusing hydrogen atoms into ____ atoms in its core.
a. carbon
b. helium
b. helium
300
Our Sun is NOT ____.
a. a part of a binary system
b. a main sequence star
c. in a galaxy
d. a medium hot star
a. a part of a binary system
300
A measure of the amount of the light given off by a star is its ____.
absolute magnitude
300
remnants of a supernova
What is a neutron star
400
A supercluster is a large cloud of gas and dust where stars are formed
False, Nebula
400
A galaxy that has a shape similar to a football is a(n) ____ galaxy.
a. normal spiral
b. barred spiral
c. elliptical
d. irregular
c. elliptical
400
All of the following are true of the Milky Way EXCEPT that it ____.
a. is a spiral galaxy
b. has more than 800 billion stars
c. is a member of the Local Group
d. is 100,000 light-years across
b. has more than 800 billion stars
400
The Sun produces energy by forming ____ in its core.
helium
400
distance light travels in one year
What is a light year
500
Irregular galaxies are neither elliptical or spiral
True
500
Although it has a greater ____ than Sirius, Rigel does NOT look as bright in the night sky.
a. apparent magnitude c. black hole
b. parallax
c. black hole
d. absolute magnitude
d. absolute magnitude
500
The coolest stars in the sky are ____ in color.
a. yellow
b. red
c. blue
d. white
b. red
500
A star begins as a ____, a large cloud of gas and dust.
nebula
500
combining of two nuclei to form a nucleus with a higher mass