Solar System

Astronomers have announced the possible discovery of the first known moon outside our Solar System. This “exomoon” is not like any in our cosmic neighborhood: it’s the size of Neptune and orbits a planet the size...

Scientists have made the first radio-telescope detection of a huge free-floating planet beyond our solar system, a new study said. The planetary-mass object, called SIMP J01365663+0933473, is about a dozen times more massive than Jupiter, the...

The sun might be unusually cool by 2050, according to a new study. On the basis of 20 years of observations and collected data, scientists have calculated that the sun will be nearly seven percent cooler...

None of the planets are expected to be hospitable to life. The eight-planet system — the largest known outside of ours — orbits a star called Kepler 90 some 2,545 light-years away. A solar system with...

News Hour: The US space agency NASA on Wednesday announced two unmanned missions to asteroids designed to study one of the earliest eras in the history of the solar system. They have been dubbed Lucy and...