8.1 Exploring Our Solar System
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by Terry Doyal
| 10 Questions
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You probably learned we once had nine planets in our Solar System. Now we have only eight! What happened? Astronomers from all over the world had a meeting to decide on the definition of a planet. When they were finished Pluto was no longer considered to be a planet. It is now called a dwarf planet.
Watch the Space School Pluto video to find out more about Pluto and its reclassification from planet to dwarf planet. You will use the video to help you answer the questions that follow. You may pause the video to record your answers. You should also make sure the Close Captioning (CC) button is turn on.
1
10 pts
When was Pluto first discovered?
2
10 pts
When was Pluto reclassified as a dwarf planet?
3
10 pts
What are the three rules to be classified as a planet? List them below.
4
10 pts
What rule does Pluto not follow?
5
10 pts
According to scientist, Pluto is composed mostly of
fire and ice
rock and ice
rock and fire
6
10 pts
The surface of Pluto is composed almost entirely of
Hydrogen, frozen methane and carbon monoxide
carbon monoxide, nitrogen and hydrogen
frozen methane, nitrogen and carbon monoxide
7
10 pts
Pluto has strong gravity.
True
False
8
10 pts
Pluto is one of the coldest planets in our universe.
True
False
9
10 pts
Look at the picture above. These are dwarf planets from our solar system compared to the Earth’s moon. How does Pluto’s size compare to our moon?
10
10 pts
Which of these dwarf planets is larger than Pluto? (Ignore the negative sign in front of the numbers.)
Charon
Sedna
Eris
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