26th September 1905 Einstein’s Theory of Special Relativity is published. It is the generally accepted and experimentally confirmed...

5th July 1687 The book Principia is published by Sir Isaac Newton. Written in Latin with the title Philosophiæ Naturalis Principia...

13th June 1983 Pioneer 10 becomes the first human-made object to pass outside Pluto's orbit and leave the solar system. It was the...

2nd May 1780 Sir William Herschel discovers the first binary star, Xi Ursae Majoris, also named Alula Australis, in the constellation of...

Sara Cabrera is a Sydney City Skywatcher member and an active observer. Her curiousity to always learn more about astronomy took her...

13 February 1633 Italian astronomer Galileo Galilei arrived in Rome to face charges of heresy for advocating the Copernican theory, which...