By the end of the 19th Century, the relative spacing of the planets was known but the absolute distance between them was not. This scientific mystery spanning centuries was finally solved by accurate measurement of Venus Transits of 1874 and 1882.

Offering un-obstructed views of the Sun from horizon to horizon and superb weather, Hawaii was perfect for astronomers to view Venus Transits in 1874 and 1882. Such observations accurately determined the scale of the Solar System for the first time.

While Kepler and similar missions are turning up planets by the fist full, there’s long been many places that astronomers haven’t expected to find planetary systems. The main places include regions where gravitational forces conspire to make the region around potential host stars too unstable to form into planets. And ...

The author describes his vision for the future in the new novel '2312.'

NASA's Marshall Space Flight Center in Huntsville, Ala., successfully completed wind tunnel testing for Sierra Nevada Corp. (SNC) Space Systems of Louisville, Colo. The test will provide aerodynamic data that will aid in the design of the new Dream Chaser Space System.

The main parachutes deploy for Boeing's crew capsule during a parachute drop test on May 2, 2012. This is the second successful parachute drop test for its Crew Space Transportation (CST) spacecraft, part of Boeing's effort to develop commercial crew transportation capabilities that could ferry U.S. astronauts to and from ...

The Mexican government on Tuesday launched a national tsunami system to monitor quakes around the world that could impact the country's coastline, the Interior Ministry said.

Three planets whip around a star in less than two days, with the closest planet taking less than half a day.

Our solar system is four and a half billion years old, but its formation may have occurred over a shorter period of time than we previously thought, says an international team of researchers from the Hebrew University of Jerusalem and universities and laboratories in the US and Japan..

The HD 10180 system could host up to nine planets, according to a new study.