On 25th of April 1990 the Hubble space telescope was placed into orbit by the space shuttle Discovery.

Above the distortion of the atmosphere, far far above rain clouds and light pollution, Hubble has an unobstructed view of the universe. Scientists have used Hubble to observe the most distant stars and galaxies as well as the planets in our solar system.

NASA

Hubble has made more than 1.3 million observations since its mission began in 1990.