Most astronomers are sceptical about the existence of Planet Nine, but mathematical models suggest there is something unseen out there

The Earth’s atmosphere now carries over 400 parts per million of carbon dioxide

Trinity College Dublin omitted from scale due to blunder over incorrect data

That’s Maths: If such a planet is found, the solar system must be much larger than we had imagined

Existence of ‘Planet Nine’ shown by examining gravitational influence on other bodies

‘Curiosity’ rover continues hunt for clues about the possibility of life on the Red Planet

Disneyland closes rides as a precaution following second earthquake in two weeks

The 2011 Japanese earthquake has increased the chances of a big hit on the city – and Ireland is not safe from tsunamis either

More than 20 years ago, Alan Ereira made a film about an elusive Colombian people who changed how he saw the universe. A follow-up has an urgent warning for mankind

Scoop of fine-grained sand collected by Curiosity rover is analysed

Spacecraft launched 36 years ago is now 11.5bn miles from the Sun

Voyager 1 is on a lonely journey away from the sun and its planets

Curiosity rover returns signs of sulphur, oxygen and carbon