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One night before David went to bed, he was playing in his 

cardboard spaceship and modeling his astronaut suit for his 

parents.

As David fell asleep that night he wondered what it would be 

like to travel in a real rocket ship.

Next thing he knew, David found himself 

flying through space in what appeared to be a 

real rocket ship!

While David was exploring space, he saw two 

men, each on different planets arguing about 

whether the Sun or Earth was located in the 

center of the Solar System. 

Claudius Ptolemy was on Mercury while 

Nicolaus Copernicus was on Venus. 

Nicolaus Copernicus was a mathematician and an astronomer. 

He was born in 1473 in Torn, Poland. He was the fourth and 

youngest child in his family. 

In 1510, Copernicus moved to a residence in the Frombork 

Cathedral Chapter in hopes of clearing additional time to study 

astronomy. Copernicus believed that the Sun was in the center 

of the Solar System. This model was called Heliocentric.

He included his model in his book called Commentariolus in 

1514.

Then as David was traveling, he saw 

Johannes Kepler and Tycho Brahe on Earth 

and Mars. They were backing up Copernicus 

theory that the Sun was in the center of the 

Solar System.

Johannes Kepler was born in 1571 in Germany. 

He was an astronomer and was the first one to explain the 

motion of the planets of our solar system. 

He agreed with Brahe's statement that Copernicus was right, 

the sun is in the   center and that the solar system is   orbited in 

an oval not a circle. 

He was also a mathematician. He witnessed both a comet in 

1577 as well as a lunar eclipse in 1580.One of his famous 

quotes was “Nature uses as little as possible of anything.”

Tycho Brahe was born in 1546 in Sweden. 

He was a astronomer and scientist. 

He had a twin but the twin died after he was born. 

He entered the University of Copenhagen when he was only 

12. He was the first one to agree with Copernicus' theory of the 

heliocentric model. But he made some corrections on the 

theory with precise and comprehensive astronomical and 

planetary observations. 

At the age of 25, he discovered a new star and he determined 

the position of each star or planet with a "quadrant".

Then as David was passing through Jupiter, he saw 

Galileo throw the trophy of triumph to Copernicus, as  

Galileo proved that the Sun was in the center of the Solar 

System.This is when David stared in awed that the Solar 

System was heliocentric.

Galileo Galilei was born in 1564 in an Italian city,Pisa. 

Galileo’s first job was as an art teacher however, he was 

known for being a physicist and philosopher. 

He was the first person to record observations of the 

heavens with a telescope. With this he was the final person to 

prove the sun was in the center of the solar system. 

Using the telescope he discovered many things about the 

planets, such as rings around Saturn, moons have mountains, 

Venus has phases, and much more. 

Then David saw someone on Saturn looking at the stars. 

He recognized her and realized it was Annie Jump 

Cannon. Annie saw David passing by and threw him a 

star!

Annie Jump Cannon was born in 1863 in Delaware. 

Her mother taught her about the constellations and sparked her 

interest in outer space at a young age. 

Annie attended Wellesley College where she studied physics and 

astronomy. 

She joined a group of female astronomers nicknamed "Pickering's 

Women", where she studied bright southern hemisphere stars. 

She classified more than 225,000 stars and in the 1920's she 

discovered 300 variable stars. She also was able to discover 5 novae, 

a class of exploding stars! 

She could classify up to three stars a minute.

After admiring the star David was given, he saw 

Edwin Hubble on Uranus. He watched the 

astronomer looking around the fascinating aspects 

of the Milky Way. Then he saw David and threw 

him a Milky Way Bar!

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