In the late 1500s, Florentine astronomer, physicist, and engineer Galileo Galilei theorized that mass does not affect gravitational pull, contradicting Aristotle. Galilei believed that all things fall ...

Discovered by Galileo in 1610, Io has since become one of the most fascinating objects in planetary science. Orbiting just ...

Harvard University professor Avi Loeb leads “The Galileo Project,” which seeks to find direct evidence of extraterrestrial life and technology rather than asking governments for what they have ...

Early telescopes were all refracting telescopes of the kind Galileo made. While they revolutionized the science of astronomy, they had some innate downsides. The act of refraction also causes ...

Galileo satellite GSAT0104, alongside its fellow In-Orbit Validation (IOV) satellites, made history by enabling the first ...

The telescope and its magnifying power changed astronomy forever. Galileo's telescope allowed him to magnify the planets, just points of light to the unaided eye, into bright discs covered in ...

Galileo Galilei is arguably the most important scientist to ever live. He perfected the first telescopes, turned them toward the Universe and what he discovered changed the course of history forever.

If you are interested in recording your observing efforts, the Astronomical League offers a program called Galileo’s TOES, where you observe each of these four phenomena (transits, occultations ...