How many of these questions can you answer correctly?

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1. How many planets are in the Solar System?
2. What is the fifth planet from the Sun?
3. What is an astronomical unit?
4. How many terrestrial planets are in the Solar System?
5. What can be found between Mars and Jupiter?
6. Why was Pluto "demoted" as a planet?
7. What kind of star is the Sun?
8. What is the hottest planet in the Solar System?
9. What is the surface temperature of that planet?
10. Earth is located within the circumstellar habitable zone, which is frequently referred to as what?

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JoyfulSilence · 46-50, M

I answered from memory, without looking at other replies here, or Googling anything.
1. Eight
2. Jupiter
3. The mean distance from the Sun to the Earth.
4. Four
5. Asteroid Belt
6. Objects were found further out that were larger than Pluto, and people did not want to have to call them planets.
7. I am not sure what the spectral class number is.
8. Venus, if we are just talking about the upper atmosphere or surface. But I bet Jupiter has the hottest core.
9. Maybe 700 degrees F?
10. Goldilocks Zone

Arithmoman · 31-35, M

@JoyfulSilence Good job! 700 degrees Fahrenheit is very close. The surface temperature is 900 degrees Fahrenheit. The runaway greenhouse effect has caused it to have a higher surface temperature than Mercury.

Also, Pluto crosses the orbit of Neptune. I think that was one of the reasons for the declassification.