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Hey there! I'm Roxy and this is my dog Ringo.

We are using math to learn about outer space. Math makes it 

easy to separate fact from fiction. Let me tell you what we 

have learned about the part of the 

universe we live in, our solar system.

Astronauts are people who travel 

into space. Sorry Ringo but no dogs 

allowed. Once in space, astronauts 

can see how the earth spins on its 

axis to experience sunsets and 

sunrises. It takes 24 hours for one 

rotation, which is why there are 24 

hours in one day. Astronauts 

experience 15 to 16 sunrises and 

sets everyday!

Our first stop is the moon. It is the only land form in 

space to ever be visited by humans.

The moon is 238,855 miles (384,400 

km) away from the earth. Think 

about how big that number is! It is 

almost 100 thousand times greater 

than the distance from Disney World 

to the Florida-Georgia border.

There are eight planets and one 

dwarf planet in our solar system. 

They all orbit the sun. The sun is 

a hot star at the center of our 

solar system. The amount of time 

it takes a planet to complete one 

orbit is the length of a year for 

that planet. On earth, one year is 

365 days because that is how long 

it takes the earth to travel   once 

around the sun. Earth is the third 

planet from the sun. 

The closer the planets have 

shorter years and the farther 

ones have longer years. Why 

do you think that is?

It is because the closer planets have 

less distance to travel, so they can 

finish one lap, orbit, quicker. The 

closest planet is Mercury and the 

2nd closest is Venus.

Mercury and Venus are both very hot planets because 

they are so close to the sun, which gives off heat. If 

Mercury reaches 801 F on its daytime side and 279 on 

its night time side, what is   the difference between 

night and daytime temperatures? What is the 

difference between a 82 F day on earth in Florida and 

Mercury's night time temperature?

The next planet in the line up is Mars. There 

are no martians here but water has been found 

by space robots sent from Earth. This planet is 

the most similar in geographical composition 

to earth.

The Earth is   about 92 

million miles away 

from the sun. Mars is  

about 141 million 

miles away from the 

sun. How much farther 

away is Mars from the 

Sun?

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