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Before the Hubble Space Telescope was launched, scientists thought they knew the universe. They were wrong.
The Hubble Space Telescope has changed many scientists’ view of the universe. The telescope is named for American astronomer Edwin Hubble, 1 . He established that many galaxies exist and developed the first system for their classifications.
In many ways, Hubble is like any other telescope. It simply gathers light. It is roughly the size of a large school bus. What makes Hubble special is not what it is, 2 .
Hubble was launched in 1990 from the "Discovery" space shuttle and it is about 350 miles above our planet, 3 . It is far from the glare of city lights, it doesn’t have to look through the air, 4 . And what a view it is! Hubble is so powerful it could spot a fly on the moon.
Yet in an average orbit, it uses the same amount of energy as 28 100-watt light bulbs. Hubble pictures require no film. The telescope takes digital images 5 . Hubble has snapped photos of storms on Saturn and exploding stars. Hubble doesn’t just focus on our solar system. It also peers into our galaxy and beyond. Many Hubble photos show the stars that make up the Milky Way galaxy. A galaxy is a city of stars.
Hubble cannot take pictures of the sun or other very bright objects, because doing so could "fry” the telescope’s instruments, but it can detect infrared and ultra violet light 6 . Some of the sights of our solar system that Hubble has glimpsed may even change the number of planets in it.

A. which is above Earth’s atmosphere.
B. which are transmitted to scientists on Earth.
C. which is invisible to the human eye.
D. who calculated the speed at which galaxies move
E. so it has a clear view of space.
F. because many stars are in clouds of gas.
G. but where it is.