Hubble Space Telescope
The Hubble Space Telescope is a large telescope that was launched into space in 1990 and has been used to see images that were, before Hubble, too far to see. Just recently, on October 20th, Hubble captured an image of a twisted cosmic knot in the constellation cancer as shown in the image below. This is 250 million light years away. A cosmic knot is what occurs when two galaxies collide to form a new galaxy. This galaxy, NGC 2623, stretches approximately 50000 light years from end to end. When galaxies merge, star clusters begin to form which is shown by the specks of bright blue that exist throughout the twisted cosmic knot. These newly formed clusters are blue because the blue stars inside the cluster are much hotter than the other stars. As time goes on the clusters will change to red because the blue, hotter stars will die out faster. Hubble has been extremely useful in the world of astronomy for discoveries like NGC 2623 and many others. Its groundbreaking technology has helped us to significantly improve our understanding of the universe.