Sun , Stars and Pluto

• Our sun is a medium, yellow star

• This energy comes from the Sun’s two main gasses: Helium & Hydrogen

• Our Sun looks like the brightest because it is so close

• A star's size, temperature, and distance from us determines their brightness

• Color of stars tells you their temperature

• Red are the coldest

• Orange and yellow are the next hottest (This is our sun which is 9,941^oF)

• Blue and white stars are the hottest (can get up to 100,000^oF)

Poor Pluto!

It’s bad enough to be the runt of the group, but to be told after 75 years that you’re not even a member of the club - what an insult!

Scientists had to rethink the rules for what is counted as a planet. They decided on the following three criteria:

1. It must orbit the sun.

2. It must hold a sperical shape

3. It must have enough gravity to clear its orbit of debris.

NEITHER Pluto nor Eris qualified.

After Eris was discovered, scientists had to make a decision. Either Eris was the 10th planet in the solar system or it was not a planet at all! And if Eris wasn’t a planet, could Pluto be considered one?