All the biggest science news stories of the week.

All the biggest science news stories of the week.
The Chicxulub asteroid brought the age of the dinosaurs to an end ROGER HARRIS/SCIENCE PHOTO LIBRARY The asteroid…
The ice floe cracks up around the Endurance Royal Geographical Society After the British ship Endurance (pictured above)…
Earth was once covered by a global magma ocean, which later cooled and crystallised – now traces of…
Earth was once covered by a global magma ocean, which later cooled and crystallised – now traces of…