Name ___________________________________Period________ Date________
Exploring the Outer Solar System: CH 25.4 pgs. 810-815
ASTEROIDS pg. 809
1. Asteroids are found beyond____________ in a region of the solar system where small
_________________________ called _________________________can be found orbiting the Sun.
This region is referred to as the ___________________________ and is found between the inner and
outer solar system.
2. Astronomers have discovered approximately how many asteroids _____________________.
3. What is the size of most asteroids_________________.
4. So far, only three are larger than _______________________ across.
5. The largest asteroids have enough_______________ to have pulled themselves into nearly
________________________________ while forming.
6. The smaller can have very ___________________________.
7. What is the cause of odd shapes? _________________________________________________
8. In the past, scientists thought that asteroids were the remnants of a _________________________.
9. What do scientists know hypothesize about asteroids?
10. What is the support for this hypothesis?
THE GAS GIANTS-pg. 810
1. The Gas planets _____________________________________________ are very different from the
______________________________________. They are much ___________________due to their
distance from the ______________. All four planets are much _________________ and
more_____________________________ than the terrestrial planets. They are composed mainly of
____________________and ________________________ which is why they are often referred to as
2. None of the gas giants have ______________surfaces. In fact, the pressure is so great inside each
planet that ___________________________consist mostly in ______________ form.
3. What are the key characteristics of the four outer planets?
4. Why do the gas giants resemble a miniature solar system?
5. Each gas giant is surrounded by rings. Describe what a ring is….
6. The rings are so close to the planet the _________________________are very large. What might
these strong forces prevented from happening to the rings?
1. Jupiter is the first planet beyond the ____________________________. It is named for the ruler of
the ______________________________. Jupiter is the _______________________ and most
_______________________ planet in our solar system. It is composed mainly of
___________________ and _________________ like the other gas giants.
2. Describe Jupiter’s atmosphere…
3. One day in Jupiter is less than ____________ Earth hours.
4. What is the Great Red Spot on Jupiter? When was the spot first observed?
5. Jupiter’s moons…
a. Jupiter has at least how many moons?
b. What is the size of most of them?
c. Which two are similar in size to Mercury?
d. Which two are similar in size to Earth?
4. Which Moon do scientists hypothesize is the most likely place in our solar system, other than Earth,
to support life? Why do they think this?
6. What did you find most interesting about Jupiter?
1. Saturn is the ______________________ largest planet in the solar system and is best known for its
________________. Saturn’s rings are the _______________________ and most
______________________ from Earth.
2. What are the rings made of?
3. What size are the particles the rings are made of?
4. What size are the rings in diameter_________________________ and thickness________________?
5. Describe Saturn’s atmosphere…
a. How large is it?
b. How dense is it?
c. What would happen if you put Saturn in a bathtub due to its density____________________?
d. What is it made of______________________________________?
e. What do scientists think happens to the Helium in Saturn’s atmosphere?
6. How many moons do Astronomers think Saturn has?_____. Are they mostly small or large?
7. Describe how the moon Titan is different than Saturn’s other moons?
8. What did you find most interesting about Saturn?
1. Because Uranus is so for from the _______________ it is very __________________. Uranus’
atmosphere is also mostly ________________ and __________________. However, it also has a
large amount of ______________________ which gives Uranus its distinct___________________
2. Describe the structure of Uranus…
c. Surrounding the Mantle
3. Does Uranus have rings? _________. If so, describe them…
4. Does Uranus have moons? _________. If so, how many and are they big or small?
5. What is Uranus’s most unusual characteristic? Please describe.
6. What do scientists hypothesize caused such a severe tilt of Uranus’ axis?
7. What direction does Uranus rotate in relation to its revolution around the sun?
8. What happens to the northern and southern hemisphere’s of Uranus due to its severe tilt on its axis?
9. What did you find most interesting about Uranus?
1. Neptune is so far from the ____________ that it takes a very long time _____________________ for
it to make one revolution around the sun. In comparison, how many days does it take for the Earth to
revolve around the sun? _______________. Neptune has the same composition and is about the
same size as ___________________.
2. Neptune’s atmosphere has clearly _______________________________________. The clouds can
be described as_____________, _______________ and similar to cirrus clouds in the
3. The clouds in the Earth’s atmosphere are made of___________________________ while the clouds
in Neptune’s atmosphere are made of___________________________________,
4. What gives Neptune its bluish color?
5. Neptune also has large storms. What was the storm called that was observed by the
_____________________, Voyager 2 in _______________?
6. Describe Neptune’s rings?
7. How many moons does Neptune have?
8. What did you find most interesting about Neptune?
Summarize Pluto’s first paragraph as to why they think Pluto shouldn’t be a planet. Also, list three
main facts about Pluto that you find interesting.
The Edge of the Solar System
1. The solar system does not ___________at Pluto’s orbit. Astronomer’s estimate that there may be
___________________________________________ of objects, mostly made of
_________________________________________________ that orbit the sun in the Kuiper belt.
2. What is the Kuiper Belt?
3. What is its distance from the sun? ______________________.
4. Most of the objects in the Kuiper Belt_______________________________________________
5. Beyond the _____________________________lies a great reservoir of comets called the
6. The Oort Cloud is a very _________________________________________________
7. What is the difference between the Oort Cloud and the Kuiper Belt?