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History's most famous science satellites have grown to enormous proportions

More than 58 years have passed since Sputnik 1 made history as the first artificial satellite to orbit Earth. Launched by the Soviet Union on October 4, 1957, Sputnik 1 consisted of a 23-inch-diameter metal sphere with four radio antennae — that's it.

Compared to the highly sophisticated satellites in orbit today, like the Hubble Space Telescope and the International Space Station, Sputnik 1 is not much to look at. However, this satellite gave scientists critical information about Earth's upper atmosphere that informed later launches.

Since that fateful October day in 1957, space agencies and private companies around the world have launched thousands of artificial satellites into orbit around Earth as well as toward more distant worlds like Jupiter, Saturn, Pluto, and beyond. As technology continues to advance, so too will the size and sophistication of our space-based instruments.

Here's some of history's most famous satellites and how they compare in size:

BI Graphics_Sizing up history's most famous science satellites
BI Graphics_Sizing up history's most famous science satellites

(Mike Nudelman/Business Insider)

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