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Planets of the Solar System. 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. Mercury Venus Earth Mars. 8. 5. 3. 1. 7.

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Presentation Transcript
slide2

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.

Mercury

Venus

Earth

Mars

8

5

3

1

7

The outer planets are mostly gas and dust.

Jupiter

Saturn

Uranus

Neptune

4

The Sun

2

6

slide3
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

slide5
Saturn is made of gas and dust. Do you think it would be bigger or smaller than Mars?

Bigger than Mars

Smaller than Mars

slide6
Match each planet name to the diagram.

Saturn

Neptune

Mercury

Earth

8

5

3

1

7

4

2

6

Venus

Jupiter

Mars

Uranus

slide7
What is Neptune mostly made out of?

Metal and Rock

Dust and Gas

astronomers are planning to define a new type of planet
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.
slide9
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