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My name is Buzz Lightyear and I'll be telling 

you all about how our solar system came to 

be the way it is today.

Our solar system began with the creation of 

the universe.   The Big Bang was the massive 

expansion of a small condensed mass, 

creating everything in the entire universe.  

This massive expansion happened 

approximately 10-15 billion years ago.  

Now in our solar system, the sun was formed 

approximately 4.6 billion years ago.   It was 

created from a cloud of dust and gas that 

originated from the Solar Nebula.   Over 

millions of years, as the dust collected, it 

eventually formed the sun and the planets.

The sun is nearly a perfect sphere with a 

radius of 695,508 km.   The sun has a 

temperature of 5500 degrees celcius.

Mercury is the planet closest to the sun.  

Mercury completes only three rotations on its 

axis per two orbits around the sun.   Its orbital 

period is approximately 88 Earth days.   The 

planet has .055 as much mass as Earth and 

has a diameter of 4879 km.

Mercury was formed when dust

came together forming large

clumps and eventually the 

planet Mercury itself.

Venus, the next closest planet to the sun, has 

an orbital period of approximately 225 Earth 

days and is the second brightest object in the 

night sky only after the moon.

Venus was formed when two huge, planets 

collided head-on and merged to form Venus. 

Earth, your home planet, was formed much 

like Mercury in the way that dust collected 

from the explosion of the Big Bang to create 

the planet.   Approximately 4.5 billion years ago 

a large asteroid collided with Earth and while 

some of this asteroid merged with Earth, some 

of Earth broke off to form what eventually 

became the moon.   This collision also gave 

Earth its tilt of roughly 23 degrees.

Mars, known as the red planet due to its 

appearance, formed from the collection of dust 

particles solidifying.   Volcanic lava also aided in 

the formation of modern day Mars.   Mars is 

known for its extreme climate due to its 

elliptical orbit around the sun.

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