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It is the first artificial satilite in orbit. This starts the space race. This is important because it helped us understand space better.
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Laika, the dog on board, became the first live being in space. This proved that live beings can go in space.
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It is the first up close images that we got of the sun. This helped us understand our solar system better.
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This starts a big rivalry between America and The Soviet Union.
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It sets the stage for the Apollo landing. This is important because it proves space travel to be much more dangerous.
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This puts the first man on the moon, ending the space race. This is important because it helps us to better understand the moon and its' properties.
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Apollo had an oxygen tank explode and had to fix it in space. This marked the decline of the Apollo missions. This is important because it proved a flaw in the design and helped us understand that space travel needs to be almost perfect for a flight to work.
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This is important because it marks the start of a new type of space travel that can be reused.
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This is the first space station. This is important because it helped us understand the effect space had on people's bodies.
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This is important because it is bigger than Mir was and works on giant solar panels. It has helped many studies along and let scientists work on their experiments.
