From helping to determine the age of the universe to proving the existence of black holes, the $2.5bn Hubble Space Telescope has been a hugely powerful tool of scientific discovery.
Friday marks 25 years since the telescope was first launched.
It was not the first space telescope, but when it was launched into low Earth orbit in 1990, it carried onboard an unprecedented array of instruments: a 2.4-metre mirror and four main sensors designed to capture ultraviolet, visible, and near infrared light.
Putting the telescope above the distortion of Earth’s atmosphere gave it the ability to take very high-resolution images without the interference of background light.
“I like to describe the atmosphere being something like looking through an old stained glass window,” said Dr Nancy Grace Roman, the first chief astronomer at NASA.
“The glass has defects in it and that sort of keeps you from getting a sharp picture, and the atmosphere also has defects.”
Looking back in time
During its 25 years in service, Hubble has captured some remarkable images of space, including galaxies so far away that the view we get of them comes from a period when the universe had just been created, thus allowing scientist to effectively look back in time.
“The achievements are spectacularly displayed in superb images,” says Francisco Diego, a senior research fellow at the Department of Physics and Astronomy at University College London.
“With unprecedented detail these have decorated the front pages of newspapers and magazines worldwide. But beyond images, it’s spectrometers have analysed the light of faint objects inaccessible from the ground.”