The Space Telescope Hubble has changed the way we look at the universe. In its 25 years of activity it has captured over a million images of deep space.
The Hubble drifts 370 miles above the Earth, in a much better position to observe the cosmos1 than ground-based telescopes. It avoids the distortions of the atmosphere, and takes extremely high-resolution images with very little background light.
NASA Administrator2 Charlie Bolden says: "Even the most optimistic person to whom you could have spoken back in 1990 couldn't have predicted the degree to which Hubble would rewrite our astrophysics and planetary science textbooks."
Before the telescope was launched, there were doubts about the age of the universe. Some said it was 10 billion years old and others thought 20 billion. Now, thanks to Hubble's observation of stars, we know it's 13.8 billion years old. The telescope has also helped to reveal the accelerating expansion of the universe and provided evidence of the existence
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