The first publication by Galileo Galilei has set a new auction record for the celebrated astronomer, selling for $1.5 million ...

Sunspots are the most striking phenomenon of the solar magnetic field. After the invention of the telescope early in the 17th ...

In 1609 when Galileo Galilei pointed his home-made telescope at Jupiter, he also noticed smaller spots of light. He studied the motions of these spots and deduced they were moons of Jupiter.

While Galileo's use of the telescope to find new facts in nature brought down the wrath of the church in Rome, Leeuwenhoek was born in the more tolerant Netherlands in the same year (1632) that ...

In his 2006 book, Galileo’s Instruments of Credit: Telescopes, Images, Secrecy, Biagioli chronicles how Galileo, then a 46-year-old professor in Padua, parlayed his discoveries and technical ...

Galileo launches Agentic Evaluations to help enterprises evaluate and monitor AI agents, securing $68M in funding as companies like Cisco adopt its platform for safer AI deployment.

A do-it-yourself Galilean telescope makes an excellent and inexpensive starter telescope — or science fair project.

2009 is the International Year of Astronomy, celebrating the 400th anniversary of Galileo turning a looking glass to the sky and shaking up humanity's view of the heavens.

A century ago, a brash astronomer leaked a discovery that opened our view to the cosmic distance scale and the nature of galaxies.

From the discovery of gravity to the first mission to defend Earth from an asteroid, here are the most important physics experiments that changed the world.