Hubble: The telescope is named after the astronomer Edwin Hubble. Carried into orbit by a Space Shuttle in 1990 and remains in operation. Among its many discoveries, Hubble has revealed the age of the universe to be about 13 to 14 billion years. Hubble played a key role in the discovery of dark energy, a mysterious force that causes the expansion of the universe to accelerate. It discovered that gamma-ray bursts, strange, incredibly powerful explosions of energy, occur in far-distant galaxies when massive stars collapse. The purpose of the Hubble space telescope is so that astronauts, astronomers, and the public can discover new images of our galaxy, other planets, and other galaxies.