Space Waste
Burned-out satellites are dangerous. So are the rockets that took them into space. Parts of these rockets stay in space. Many still hold Rocket fuel. That can explode, splintering the rocket into small pieces. That just makes more space junk. The US and the former Soviet Union tested wepons by shooting at old satellites. One of China's missles shattered a weather satellite. More than 2,800 pieces of new trash were created-the single worst case of space littering.

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Leftover Litter
Space junk can make more space junk. Two years ago, two satellites collided. More than than 1,600 pieces, large and small, became space junk. There are other kinds of space trash too. Such as "screws and gloves". Even chipped paint can become space junk. So can regular trash that's tossed from space stations. About 300,000 pieces larger than a cornflake now litter in space. All this trash threatens new missions. It makes space more dangerous for explorers

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Core To Crust:
To picture the Earth, think of a boiled egg. Picture the yolk, egg white, and shell. Earth's "yolk"is called the core. It is the deepest layer. The core is very hot! Hotter than your stove four times. Next is the Earth's thick mantle is made of partly melted rock. Finally come the Earth's cool crust. It is like an eggshell- the thinnest layer. The crust is where we live. All you see is part of it. Valleys, fields, and een the oceans are part of the crust.

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Cool Planet:
And what a long story it is. Earth is 4.5 billion years old! At first, it was just a big blob of melted rock. Slowly, the planet cooled. The heaveiest things such as iron sank down. Lighter materials rose up. Over hudreds of millions of year, the materials formed three main layers. No one has drilled to the Earth's deepest layers, Not yet at least. but scientists know what the layers are like. By studying earthquakes, they know some layer are made of liquid metal. Other layers are made of hard rock.

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