Galileo precedes today’s physicists by many generations, but his work underscores the interplay of intellect and observation ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

Evidence suggests ancient civilizations, including the Greeks, may have had early optical knowledge and devices like ...

For most of history, the Moon was regarded as a mysterious and powerful object. Then scientists made it into a destination ...

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

An event called a "ring plane crossing" will occur between Saturn and Earth on March 23, 2025, when Saturn's rings will ...

As more satellites, telescopes, and other spacecraft are built to be repairable, it will take reliable trajectories for ...

In 1609, the Italian astronomer Galileo Galilei upended the Earth ... into his system a location that he has selected to shoot. His telescope, set up on his deck, aligns automatically with Polaris ...

In 1610, astronomer Galileo Galilei used the newly invented telescope to show that the Milky ... Messier was interested in comets, so his list was a set of fuzzy objects that might be mistaken ...