Astro 7N ACTUAL UPDATED Exam
Questions and CORRECT Answers
The Sun formed - CORRECT ANSWER - at the center of a spinning disk made of gas and
dust
The planets in our Solar System are thought to have come from - CORRECT ANSWER -
the same cloud of gas and dust in which the Sun formed
As the solar nebula collapsed, it became a disk because - CORRECT ANSWER - the
overall rotation of the nebula plus collisions between particles made the particles go in more or
less the same direction
Why do the planets orbit the Sun in close to the same plane? - CORRECT ANSWER -
because they all formed in a disk around the early Sun and there was little material outside of
that disk
How long ago did the Sun and the Solar system form? - CORRECT ANSWER - 4500
million years = 4.5 billion years ago
Because of the temperatures in the protoplanetary disk, - CORRECT ANSWER - Rocks
and metals froze in both the inner and outer regions, and ices and H and He gases froze only in
the outer region
Which of the following is not a characteristic of jovian planets - CORRECT ANSWER -
They have a higher density than terrestrial planets
Which planet has a moon with many sulfur volcanoes - CORRECT ANSWER - Jupiter
Which planets have a rocky, relatively dense composition - CORRECT ANSWER -
Mercury, Venus, Earth, Mars
,Which of the following statements is false? - CORRECT ANSWER - Jupiter's moon Io
does not have any volcanic activity
What properties characterize all the Jovian planets (compared to Terrestrial planets)? -
CORRECT ANSWER - Many moons, large size, low densities
Jupiter looks pretty ____ and really different from the other planets we've look at so far. ____,
too. - CORRECT ANSWER - Big, colder
If Jupiter was the size of a basketball, Earth would be the size of a(n) - CORRECT
ANSWER - marble
Jupiter has about the overall density of - CORRECT ANSWER - Milk
Jupiter is primarily composed of: - CORRECT ANSWER - Hydrogen and Helium
The top cloud layers of Jupiter are made of - CORRECT ANSWER - Ammonia and
ammonia compounds
The Great Red Spot is an enormous storm that has lasted for: - CORRECT ANSWER -
about 300 years
The weather on Jupiter is usually - CORRECT ANSWER - winds of hundreds of miles per
hour, thick clouds
Jupiter's day is ___ hours long. - CORRECT ANSWER - 10
, What do you think Jupiter is like below the top cloud layers? - CORRECT ANSWER - It's
gaseous on the outside, then liquid hydrogen, then more dense metallic hydrogen, possibly
surrounding a solid core
How can Jupiter have a magnetic field (without having a large metal core like Earth)? -
CORRECT ANSWER - It has metallic hydrogen inside, which circulates and makes a
magnetic field.
Tidal heating on Io causes - CORRECT ANSWER - sulfur volcanoes
If tidal heating warms up the interior of Europa, there might even be a _________ underneath
that icy crust: - CORRECT ANSWER - liquid water ocean
Sort of like Europa, Ganymede also has - CORRECT ANSWER - an icy crust
Even though Ganymede, was bigger, this is still a pretty respectable moon, too. I'd say that
Callisto is about the same size as - CORRECT ANSWER - Mercury
Jupiter is about three times as massive as Saturn, but only slightly larger. Why? - CORRECT
ANSWER - Adding mass increases gravity and compresses gasses
Saturn is made of - CORRECT ANSWER - Hydrogen and Helium like Jupiter
What are Saturn's rings made of? - CORRECT ANSWER - The rings are made of billions
of icy particles that range in size from tiny grains to mountains
Which of Saturn's moon has one bright side and one dark side? - CORRECT ANSWER -
Iapetus
Which of Saturn's moons orbits in the opposite direction relative for the others? - CORRECT
ANSWER - Enceladus
Questions and CORRECT Answers
The Sun formed - CORRECT ANSWER - at the center of a spinning disk made of gas and
dust
The planets in our Solar System are thought to have come from - CORRECT ANSWER -
the same cloud of gas and dust in which the Sun formed
As the solar nebula collapsed, it became a disk because - CORRECT ANSWER - the
overall rotation of the nebula plus collisions between particles made the particles go in more or
less the same direction
Why do the planets orbit the Sun in close to the same plane? - CORRECT ANSWER -
because they all formed in a disk around the early Sun and there was little material outside of
that disk
How long ago did the Sun and the Solar system form? - CORRECT ANSWER - 4500
million years = 4.5 billion years ago
Because of the temperatures in the protoplanetary disk, - CORRECT ANSWER - Rocks
and metals froze in both the inner and outer regions, and ices and H and He gases froze only in
the outer region
Which of the following is not a characteristic of jovian planets - CORRECT ANSWER -
They have a higher density than terrestrial planets
Which planet has a moon with many sulfur volcanoes - CORRECT ANSWER - Jupiter
Which planets have a rocky, relatively dense composition - CORRECT ANSWER -
Mercury, Venus, Earth, Mars
,Which of the following statements is false? - CORRECT ANSWER - Jupiter's moon Io
does not have any volcanic activity
What properties characterize all the Jovian planets (compared to Terrestrial planets)? -
CORRECT ANSWER - Many moons, large size, low densities
Jupiter looks pretty ____ and really different from the other planets we've look at so far. ____,
too. - CORRECT ANSWER - Big, colder
If Jupiter was the size of a basketball, Earth would be the size of a(n) - CORRECT
ANSWER - marble
Jupiter has about the overall density of - CORRECT ANSWER - Milk
Jupiter is primarily composed of: - CORRECT ANSWER - Hydrogen and Helium
The top cloud layers of Jupiter are made of - CORRECT ANSWER - Ammonia and
ammonia compounds
The Great Red Spot is an enormous storm that has lasted for: - CORRECT ANSWER -
about 300 years
The weather on Jupiter is usually - CORRECT ANSWER - winds of hundreds of miles per
hour, thick clouds
Jupiter's day is ___ hours long. - CORRECT ANSWER - 10
, What do you think Jupiter is like below the top cloud layers? - CORRECT ANSWER - It's
gaseous on the outside, then liquid hydrogen, then more dense metallic hydrogen, possibly
surrounding a solid core
How can Jupiter have a magnetic field (without having a large metal core like Earth)? -
CORRECT ANSWER - It has metallic hydrogen inside, which circulates and makes a
magnetic field.
Tidal heating on Io causes - CORRECT ANSWER - sulfur volcanoes
If tidal heating warms up the interior of Europa, there might even be a _________ underneath
that icy crust: - CORRECT ANSWER - liquid water ocean
Sort of like Europa, Ganymede also has - CORRECT ANSWER - an icy crust
Even though Ganymede, was bigger, this is still a pretty respectable moon, too. I'd say that
Callisto is about the same size as - CORRECT ANSWER - Mercury
Jupiter is about three times as massive as Saturn, but only slightly larger. Why? - CORRECT
ANSWER - Adding mass increases gravity and compresses gasses
Saturn is made of - CORRECT ANSWER - Hydrogen and Helium like Jupiter
What are Saturn's rings made of? - CORRECT ANSWER - The rings are made of billions
of icy particles that range in size from tiny grains to mountains
Which of Saturn's moon has one bright side and one dark side? - CORRECT ANSWER -
Iapetus
Which of Saturn's moons orbits in the opposite direction relative for the others? - CORRECT
ANSWER - Enceladus
