SpaceNASA probe will hurtle past the most distant object we’ve ever visited In 2015, NASA’s New Horizons spacecraft whizzed past Pluto. Now it is about to arrive at Ultima Thule, a tiny space rock 6.6 billion kilometres away from Earth News
EarthWhy Earth's water could be older than Earth itself How did water survive Earth's searingly hot birth? A radical new answer turns planetary history on its head – and could revolutionise the search for alien life Features