ASTR 1000 UNIT 1 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+
Based on the current scientific evidence, what is the current age of the
universe in years? You must be within 10% of the currently accepted
value. Ans✓✓✓13.8000 Gyr
Match the terms with the descriptions provided. Note that some terms
are used more than once.
A Rotation
B Astronomical Unit
C Light Year
D Orbit
The average distance between the Earth and the Sun.
Approximately 150 million kilometers.
The distance that light can travel in one year.
Earth's ______ is what primarily determines the length of a day.
Approximately 9.46 trillion kilometers.
Earth's ______ is what determines the length of a year.
The motion of one object around another due to gravity.
The spinning of an object around its axis. Ans✓✓✓B, B, C, A, C, D, D,
A
Match the terms with the descriptions provided. Note that some terms
are used more than once.
,A Galaxy
B Supercluster
C Star
D Group or Cluster
E Observable Universe
The Milky Way is one of these.
A gigantic region of space where groups of galaxies are packed more
closely than elsewhere in the Universe. Possibly the largest structures in
the Universe.
A large glowing ball of gas that generates heat and light through nuclear
fusion in its core.
A great island of stars (from a few 100 million to a trillion), dust and
gas that are held together by gravity and move around a common center.
A collection of galaxies (dozens to hundreds) bound together by
gravity.
Everything that can, in principle, be seen from Earth.
The Sun is one of these. Ans✓✓✓A, B, C, A, D, E, C
What is your cosmic address? After "OH, USA," what is the order that
you would list the following six items (from 1 to 6) so they are in the
correct cosmic order? Ans✓✓✓5: Local Supercluster
3: Milky Way
2: Solar System
6: Universe
,4: Local Group
1: Earth
On the scale of the cosmic calendar, in which the history of the universe
is compressed into 1 year, approximately how long has human
civilization existed (i.e., since ancient Egypt)?.
A) About a month
B) About a week
C) About half the year
D) A few hours
E) Less than a minute Ans✓✓✓E) Less than a minute
Why was there such a long period between when the universe began and
when the Earth formed?
A) Because it took time for earlier generations of stars to produce the
heavier elements (carbon, oxygen, nitrogen, etc.) that make up the Earth.
B) Because it took that long for the universe to expand enough for there
to be room for the Earth.
C) Because it took that long for the first stars to form.
D) Because the formation of planets is extremely rare and it took that
long to catch a lucky break and form a planet.
E) Trick question: the Earth formed very shortly after the Big Bang.
Ans✓✓✓A) Because it took time for earlier generations of stars to
, produce the heavier elements (carbon, oxygen, nitrogen, etc.) that make
up the Earth.
Identify the following statements about cosmic space as either TRUE or
FALSE.
There are certain very large regions of the universe where there are few
to no galaxies. These are known as voids.
Our Sun is very close to the center of the Milky Way Galaxy.
The Milky Way is a relatively large galaxy in our Local Group of a few
dozen galaxies.
As the universe continues to expand, our galaxy gets larger and even
distances in our solar system get larger.
Some of the individual stars we see in the night sky are very close to the
center of the Milky Way galaxy. Ans✓✓✓T, F, T, F, F
Identify the following statements about cosmic time as either TRUE or
FALSE.
The Sun formed first, and then billions of years later the Earth formed.
The Big Bang was the beginning of the expansion of the universe.
Since the Big Bang is a theory there is no actual evidence for it.
When we look at a galaxy that is 750,000 light years away, we see it as
it was 750,000 years ago.
ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+
Based on the current scientific evidence, what is the current age of the
universe in years? You must be within 10% of the currently accepted
value. Ans✓✓✓13.8000 Gyr
Match the terms with the descriptions provided. Note that some terms
are used more than once.
A Rotation
B Astronomical Unit
C Light Year
D Orbit
The average distance between the Earth and the Sun.
Approximately 150 million kilometers.
The distance that light can travel in one year.
Earth's ______ is what primarily determines the length of a day.
Approximately 9.46 trillion kilometers.
Earth's ______ is what determines the length of a year.
The motion of one object around another due to gravity.
The spinning of an object around its axis. Ans✓✓✓B, B, C, A, C, D, D,
A
Match the terms with the descriptions provided. Note that some terms
are used more than once.
,A Galaxy
B Supercluster
C Star
D Group or Cluster
E Observable Universe
The Milky Way is one of these.
A gigantic region of space where groups of galaxies are packed more
closely than elsewhere in the Universe. Possibly the largest structures in
the Universe.
A large glowing ball of gas that generates heat and light through nuclear
fusion in its core.
A great island of stars (from a few 100 million to a trillion), dust and
gas that are held together by gravity and move around a common center.
A collection of galaxies (dozens to hundreds) bound together by
gravity.
Everything that can, in principle, be seen from Earth.
The Sun is one of these. Ans✓✓✓A, B, C, A, D, E, C
What is your cosmic address? After "OH, USA," what is the order that
you would list the following six items (from 1 to 6) so they are in the
correct cosmic order? Ans✓✓✓5: Local Supercluster
3: Milky Way
2: Solar System
6: Universe
,4: Local Group
1: Earth
On the scale of the cosmic calendar, in which the history of the universe
is compressed into 1 year, approximately how long has human
civilization existed (i.e., since ancient Egypt)?.
A) About a month
B) About a week
C) About half the year
D) A few hours
E) Less than a minute Ans✓✓✓E) Less than a minute
Why was there such a long period between when the universe began and
when the Earth formed?
A) Because it took time for earlier generations of stars to produce the
heavier elements (carbon, oxygen, nitrogen, etc.) that make up the Earth.
B) Because it took that long for the universe to expand enough for there
to be room for the Earth.
C) Because it took that long for the first stars to form.
D) Because the formation of planets is extremely rare and it took that
long to catch a lucky break and form a planet.
E) Trick question: the Earth formed very shortly after the Big Bang.
Ans✓✓✓A) Because it took time for earlier generations of stars to
, produce the heavier elements (carbon, oxygen, nitrogen, etc.) that make
up the Earth.
Identify the following statements about cosmic space as either TRUE or
FALSE.
There are certain very large regions of the universe where there are few
to no galaxies. These are known as voids.
Our Sun is very close to the center of the Milky Way Galaxy.
The Milky Way is a relatively large galaxy in our Local Group of a few
dozen galaxies.
As the universe continues to expand, our galaxy gets larger and even
distances in our solar system get larger.
Some of the individual stars we see in the night sky are very close to the
center of the Milky Way galaxy. Ans✓✓✓T, F, T, F, F
Identify the following statements about cosmic time as either TRUE or
FALSE.
The Sun formed first, and then billions of years later the Earth formed.
The Big Bang was the beginning of the expansion of the universe.
Since the Big Bang is a theory there is no actual evidence for it.
When we look at a galaxy that is 750,000 light years away, we see it as
it was 750,000 years ago.
