Where are large dust clouds predominantly located in the galaxy M51?
a. distributed evenly throughout the galaxy
b. within or on the edges of the spiral arms
c. in the central bulge of the galaxy
d. in the wide spaces between the spiral arms
Where are the ionization nebulae predominantly located in the galaxy M51?
a. distributed evenly throughout the galaxy
b. within or on the edges of the spiral arms of the galaxy
c. in the central bulge of the galaxy
d. in the wide spaces between the spiral arms
Why are the ionization nebulae so bright?
a. They are the remains of stars that have died in supernova explosions.
b. They become very hot because of collisions with dust clouds.
c. They are always located very near a galaxy’s hot core.
d. They are regions where gas is ionized by hot, young stars.
a. distributed evenly throughout the galaxy
b. within or on the edges of the spiral arms
c. in the central bulge of the galaxy
d. in the wide spaces between the spiral arms
Where are the ionization nebulae predominantly located in the galaxy M51?
a. distributed evenly throughout the galaxy
b. within or on the edges of the spiral arms of the galaxy
c. in the central bulge of the galaxy
d. in the wide spaces between the spiral arms
Why are the ionization nebulae so bright?
a. They are the remains of stars that have died in supernova explosions.
b. They become very hot because of collisions with dust clouds.
c. They are always located very near a galaxy’s hot core.
d. They are regions where gas is ionized by hot, young stars.