The evidence suggests that Planet Nine is 20 times farther from the sun than Neptune and 10 times more massive than Earth

Pluto, discovered in 1930, orbits in the Kuiper Belt, a ring of asteroids and icy debris beyond Neptune. About 10 years ago it was reclassified as a (...)

This concept illustration shows a distant view from Planet Nine back towards the sun. Photograph: HO/Caltech/AFP/Getty Images

Evidence of a hidden giant planet on the fringes of the solar system has been uncovered by scientists using computer simulations. The mysterious worl(...)

Evidence of life on Mars may have been detected by Nasa’s robot ‘Curiosity’. Photograph: Nasa/JPL-Caltech/PA

Methane in the Martian atmosphere and organic chemicals in the red planet’s soil are the latest tantalising findings of Nasa’s Mars Curiosity rover as(...)

A shake map released by the US Geological Survey (USGS) shows the location and intensity of a magnitude 5.1 earthquake which occurred north-west of Brea in Orange County, California. Image: EPA/USGS Handout.

A magnitude 5.1 earthquake struck suburban Los Angeles on Friday evening, rattling a wide swath of Southern California, breaking water mains i(...)

A scene of devastation after the largest earthquake in Japan’s recorded history, in Fukushima prefecture in March 2011. Photograph: AP Photo/Kyodo News

On the afternoon of March 11th, 2011, Japan lurched eastward as the Pacific crust plates jolted beneath it. The sea floor shifted forward 60m in place(...)

Above, the Kogi tribe of Colombia, who summoned film-maker Alan Ereira back more than 20 years after his first film about them

More than 20 years ago, the British documentary film maker Alan Ereira began researching a film about a lost city in the rainforests of Colombia’s Sie(...)

Nasa’s Curiosity rover used the Mars Hand Lens Imager  to capture this set of 55 high-resolution images, which were stitched together to create this full-colour self-portrait. Photograph: JPL-Caltech/Malin Space Science Systems/Nasa/Reuters

Analysis of Martian soil by Nasa’s ongoing Mars Curiosity rover has turned up a surprising amount of water, as well as a chemical that will make a sea(...)

An artist’s graphic depicts Nasa’s Voyager 1 spacecraft entering interstellar space, or the space between stars. Photograph: JPL-Caltech/Nasa/Reuters

Voyager 1 has crossed a new frontier, becoming the first spacecraft ever to leave the solar system, Nasa says.Thirty-six years after it was launched f(...)

This artist's concept shows Nasa's Voyager 1 spacecraft exploring a new region in the solar system called the ‘magnetic highway’. After 33, NASA's twin Voyager spacecraft are still going strong and sending home information. Voyager 1, launched in 1977 to explore the outer planets, has passed into a new region on its way out of th esolar system, scientists said .

A space probe launched 35 years ago has become the first man-made object to leave the solar system, scientists said today. Voyager 1 is (...)

DICK AHLSTROM Science Editor Dust drilled from a Martian rock confirms that conditions on the Red Planet once included all the ingredient(...)