The latest stories from the Science & Environment section of the BBC News web site.
Updated: 12 min 52 sec ago
American astronomers say they have strong evidence that there is a ninth planet in our Solar System orbiting far beyond even the dwarf world Pluto.
Five planets will align across the dawn sky on Wednesday in a rare treat for skywatchers.
Global temperatures in 2015 were the warmest since records began, according to data published by meteorologists in the UK and the US.
What is China doing to clean its air?
Do beards hold the key to new antibiotics?
Images from an unmanned aerial vehicle suggest excessive management of floodplains limit their ability to hold water and slow the flow of floodwater.
Residents of one of Germany's foremost car manufacturing bases are urged to leave their vehicles at home after smog breaches maximum safe levels.
The present-day English owe about a third of their ancestry to the Anglo-Saxons, according to two new studies.
The amount of fish taken from the world's oceans has been underestimated by more than 50% according to a new study.
A company producing GM mosquitoes says it is to open a new factory in Brazil as it expands its operations.
A private UK fertility clinic is offering couples a new form of IVF treatment that allows conception to occur in the womb rather than in the lab.
This is the moment an unmanned SpaceX Falcon rocket exploded on landing after successfully delivering an ocean monitoring satellite to orbit.
Jason-3, a US-European satellite that is fundamental to our understanding of the oceans, is launched from California.
The UK government extends the "blue belt" of protected marine areas around the British coastline.
The making of British space hero Tim Peake
Nasa has ended the spacewalk involving British astronaut Tim Peake after his US colleague reported water in his helmet.
The European Space Agency is eager to develop its interest in a robot mini-shuttle just selected by Nasa to help ferry cargo to the space station.
Tim Peake is carrying out the first ever spacewalk by an astronaut representing the UK.
Major Tim Peake and Nasa astronaut Tim Kopra are repairing a faulty component outside the International Space Station.
A butchered mammoth carcass pulled from frozen sediments in the far north of Russia proves humans were present in the Arctic some 45,000 years ago - 10,000 years earlier than previously indicated.