ASTRO 1 EXAM 4 NEWEST 2025 ACTUAL EXAM

• | P a g e

ASTRO 1 EXAM 4 NEWEST 2025 ACTUAL EXAM

COMPLETE 100 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS)

|ALREADY GRADED A+ ||BRAND NEW VERSION!!

Which mysterious phenomena do scientists attribute to dark energy?

a) The increasing rate of expansion of the Universe.

b) Mysterious bonding that holds atoms together.

c) The creation of the cosmic microwave background.

d) The formation of Helium through nucleosynthesis.

e) Dark energy causes all of the above. - CORRECT ANSWER -

• the increasing rate of expansion of the universe

Why can't we see back the whole way to the time the Big Bang expansion began?

a) Not enough photons were produced.

b) Radiation is blueshifted out of the visible range.

c) Our telescopes could never be powerful enough.

d) The radiation scatters off matter frequently so the Universe is

opaque. 1 / 4

• | P a g e

e) It would take too long for light to travel that far - CORRECT

ANSWER-d) The radiation scatters off matter frequently so the Universe is opaque

What are the standard candles that were used to determine the Universe is accelerating?

• spiral galaxies
• elliptical galaxies

c) Type Ia supernovae

• light bulbs

e) Type II supernovae - CORRECT ANSWER -c) Type Ia

supernova

An older star cluster

• contains hotter stars than a younger star cluster.
• has a main sequence turnoff further to the left on the H-R

diagram.

• has a main sequence turnoff further to the right on the H-R

diagram.

• would never be located in the halo of a galaxy.
• has a bluer color than a younger star cluster - CORRECT

ANSWER-c) has a main sequence turnoff further to the right on the H-R diagram. 2 / 4

• | P a g e

Which of the following statements is TRUE?

a) One or two supernova are observed to go off in the Milky

Way galaxy each year.

b) Type II supernovae are produced by the death of a massive

star.

c) Type Ia supernovae show a lot of strong hydrogen lines in

their spectra.

d) Type Ia supernovae are produced when a neutron star

collapses to become a black hole.

e) When a planetary nebula is produced it can outshine an entire

galaxy. - CORRECT ANSWER -b) Type II supernovae are produced by the death of a massive star?

What are the differences between open star clusters and closed star clusters?

• open clusters are more concentrated, older, and have more

stars

• open clusters are less concentrated, older, and have fewer

stars 3 / 4

• | P a g e

• open clusters are less concentrated, younger, and have more

stars

• open clusters are less concentrated, younger, and have fewer

stars

• open clusters are more concentrated, young, and have more

stars - CORRECT ANSWER -d) open clusters are less concentrated, younger, and have fewer stars

Which of the following is FALSE?

• a supernova is an explosion of a high mass star at the end of

its life

• a nova can be caused by a white dwarf gaining material from

a nearby companion star

• a Type Ia supernova is caused by addition of hydrogen-rich

material onto a white dwarf

• a light echo is caused by light from an exploding star that

gradually reaches different layers of gas around the star

• a nova is more luminous than a supernova - CORRECT

ANSWER-e) a nova is more luminous than a supernova

What kind of a gas cloud can collapse and form stars?

• a very hot gas cloud that has a huge internal pressure can

collapse and form stars

• / 4