A planet is any body in orbit around the Sun that has
enough gravity to form a sphere and that has cleared
the neighborhoo...
The planets that are made of gas and
dust are much bigger than the planets
that are made of rock and metal.
Jupiter
Uranus...
Which of the following planets is mostly rock and metal?

Saturn
Uranus
Mars
Saturn is made of gas and dust. Do you think it
would be bigger or smaller than Mars?

Bigger than Mars

Smaller than Mars
Match each planet name to the diagram.
Saturn

Neptune

Mercury

Earth
8

5

3
1

7
4
2

6

Venus
Jupiter

Mars

Uranus
What is Neptune mostly made out of?

Metal and Rock

Dust and Gas
Astronomers are planning to define
a new type of planet.
This new type is a “plutoid” or “dwarf
planet.”
 Plutoids are no...
Pluto is in orbit around the sun, but it has a smaller
object in its immediate neighborhood.
Is it a planet?

Yes
No
Yes, ...
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  1. 1. A planet is any body in orbit around the Sun that has enough gravity to form a sphere and that has cleared the neighborhood near its orbit of smaller objects. The inner planets are mostly rock and metal. 8 5 1. Mercury 2. Venus 3. Earth 4. Mars 3 1 7 4 The Sun The outer planets are mostly gas and dust. 2 6 5. 6. 7. 8. Jupiter Saturn Uranus Neptune
  2. 2. The planets that are made of gas and dust are much bigger than the planets that are made of rock and metal. Jupiter Uranus Earth
  3. 3. Which of the following planets is mostly rock and metal? Saturn Uranus Mars
  4. 4. Saturn is made of gas and dust. Do you think it would be bigger or smaller than Mars? Bigger than Mars Smaller than Mars
  5. 5. Match each planet name to the diagram. Saturn Neptune Mercury Earth 8 5 3 1 7 4 2 6 Venus Jupiter Mars Uranus
  6. 6. What is Neptune mostly made out of? Metal and Rock Dust and Gas
  7. 7. Astronomers are planning to define a new type of planet. This new type is a “plutoid” or “dwarf planet.”  Plutoids are not big enough to clear their path of other objects.  Pluto is a plutoid. So are Ceres, Eris, Makemake, and Haumea. 
  8. 8. Pluto is in orbit around the sun, but it has a smaller object in its immediate neighborhood. Is it a planet? Yes No Yes, but it’s a dwarf planet

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