Galileo knew he had discovered a new planet in 1613, 234 years before its official discovery date, according to a new theory by a University of Melbourne physicist. Professor David Jamieson, Head of ...

It's been one Neptunian year—or about 165 Earth years—since astronomers first observed the most distant planet from the sun.

On the night of 1612 December 27/28, Galileo sketched the positions of Jupiter’s moons, and included a background “star” which turned out to be the planet Neptune. On the night of 1612 December 27/28, ...

July 11, 2011 marks the first full orbit of the planet Neptune since its discovery on the night of September 23-24, 1846. The discovery of Neptune is a fascinating story, full of near misses and the ...

Along with countering the geocentric system, Galileo demonstrated that our Moon was not a perfect sphere, as this had also been a long-standing belief. He was the first to deduce the Moon had craters, ...

Sixteenth-century astronomer and mathematician Galileo Galilei faced problems that would ring familiar with today's scientists, including finding funding, securing patent protection and dealing with ...

Since the demotion of Pluto in 2006 to the status of "dwarf planet," the most distant of the eight classical planets is Neptune, located at an average distance of 2,795,084,800 mi (4,498,252,900 km) ...

Galileo knew he had discovered a new planet in 1613, 234 years before its official discovery date, according to a new theory. Galileo knew he had discovered a new planet in 1613, 234 years before its ...

Galileo knew he had discovered a new planet in 1613, 234 years before its official discovery date, according to a new theory by a University of Melbourne physicist. Professor David Jamieson, Head of ...