Isaac Newton creates the first functional reflecting telescope. After studying the reflecting telescopes created by Galileo and Kepler, he determined that when light was refracted through the lens of the telescope, would distort the color (although this theory is not correct in all cases). In order to improve the telescope's capabilities, he began designing a new telescope, a reflecting telescope, which he completed in 1668. This "Newtonian Telescope" was more powerful than any refracting telescope of the same size. Rather than looking directly at the object through curved glass, which is how a refracting telescope works, a reflecting telescope uses angled mirrors to not distort color. This is the most popular type of telescope in the modern day. Image comparison courtesy of optics and binoculars.