Galileo Galilei, with a homemade telescope, noticed three points of light near Jupiter. Initially believing they were distant stars, Galileo’s repeated observations over several nights and realized ...

3 min read The Hubble Space Telescope was designed to free astronomers of a limitation that has plagued them since the days of Galileo ... The telescope's original October 1986 launch was ...

Nearly 415 years ago to the day astronomer Galileo Galilei discovered the moons surrounding Jupiter looking through his homemade telescope.

He built increasingly powerful telescopes, ultimately building devices capable of magnifying the cosmos to 30 times their original size. Galileo used his devices to rewrite humanity's ...