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Lets talk about one of my most favorite planet 

known as Venus! Venus is the only planet named 

after a female.Venus and Earth are often called 

twins.Can i get a TWINSIE!They are similar in 

size,mass,density,composition and gravity however 

thats wheres the similarities end.Venus is the 

hottest planet in the solar system although Venus is 

not the planet that is closest to the sun.It takes 

225 earth days to orbit around the sun.The average 

distance from the sun all the way back to Venus is 

67,237,910

Callisto is known as Jupiter's dead moon.Callisto 

is 4.5 billion years old and the outermost of the 

Galilean moons.The Surface tempature is -

218.47! cant u believe that? I would freeze to 

death by now.Callisto also have a thinner 

atmosphere,Callisto is half ice and half rocky 

material pretty weird.its also has the lowest 

density of all the 4 Galilean's moons Scientists 

also estimate that it has the oldest surface of any 

object in the solar system

The sun lies at the heart of the solar system.The Sun 

give life to the Earth and the Earth would have no 

life without the Sun's energy it has received.Like all 

the stars the Sun is composed of a great burning ball 

of gases.Many scientists think the sun and the rest 

of the solar system formed from a giant, rotating 

cloud of gas and dust known as the solar nebula.The 

sun has enough nuclear fuel to stay much as it is now 

for another 5 billion years. After that, it will swell to 

become a red giant.The Sun is made of 92.1% 

hydrogen and 7.8% helium

NASA use rocket to launch things   and people into 

space.Like most engines, rockets burn fuel. Most rocket 

engines turn the fuel into hot gas. The engine pushes 

the gas out its back and that gas makes the rocket move 

forward.In space, an engine has nothing to push 

against. So how do rockets move there? Rockets work by 

a scientific rule called Newton's third law of motion.His 

third law says that for every action, there is an equal 

and opposite reaction.The rocket pushes on its exhaust. 

The exhaust pushes the rocket, too. The rocket pushes 

the exhaust backward. The exhaust makes the rocket 

move forward.

The first rockets we know about were used in China in 

the 1200s. These solid rockets were used for 

fireworks.In the next 700 years, people made bigger and 

better solid rockets. M In 1969, the United States 

launched the first men to land on the moon using a 

Saturn V rocket.

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