Science/Nature

‘Planet of the chickens’: How the bird took over the world

[ad_1] Image copyright Getty Images A study of chicken bones dug up at London archaeological sites shows how the bird we know today has altered beyond recognition from its ancestors.With around 23 billion chickens on the planet at any one time, the bird is a symbol of the way we are shaping the environment, say scientists.Evolution usually takes place over a timescale of millions of years, but the chicken has
Science/Nature

Climate change: Arctic reindeer numbers crash by half

[ad_1] Image copyright KAJ R. SVENSSON/SCIENCE PHOTO LIBRARY Image caption A warmer Arctic has less food and more insects, making it a much worse environment for caribou The population of wild reindeer, or caribou, in the Arctic has crashed by more than half in the last two decades. A new report on the impact of climate change in the Arctic revealed that numbers fell from almost 5 million to around
Science/Nature

Nasa’s IceSat space laser makes height maps of Earth

[ad_1] Image copyright NASA/K.RAMSAYER Image caption A key focus for IceSat will be looking for changes in elevation over Antarctica and Greenland One of the most powerful Earth observation tools ever put in orbit is now gathering data about the planet.IceSat-2 was launched just under three months ago to measure the shape of the ice sheets to a precision of 2cm.But the Nasa spacecraft's laser instrument is also now returning
Science/Nature

ISS: Spacewalk cosmonauts investigate mystery hole

[ad_1] Image copyright NASA Image caption The two cosmonauts will spend about six hours outside the ISS Russian cosmonauts on the International Space Station (ISS) are engaged on a spacewalk to investigate a mysterious hole that caused a loss of air pressure in August.The cause of the hole on the Soyuz MS-09 spacecraft, docked to the station, has not yet been established.However, Russian officials have said they believe it was
Science/Nature

Oil thieves cause spill in Rio de Janeiro’s Guanabara Bay

[ad_1] At least 60,000 litres (16,000 gallons) of oil has spilled into Rio de Janeiro’s Guanabara Bay and the nearby Estrela river.The Brazilian oil company Transpetro said the 4km (2.5-mile) spill was caused by thieves who broke into a pipeline last week.Workers have cleared most of the oil, but a biologist said it would be weeks until the extent of the damage to local wildlife would be known. [ad_2] Source
Science/Nature

East Antarctica’s glaciers are stirring

[ad_1] Image copyright Michael Studinger/Nasa/Icebridge Image caption East Antarctica has shown very little evidence of change over the decades Nasa says it has detected the first signs of significant melting in a swathe of glaciers in East Antarctica. The region has long been considered stable and unaffected by some of the more dramatic changes occurring elsewhere on the continent. But satellites have now shown that ice streams running into the
Science/Nature

‘Surprise’ Palu tsunami clue found on seafloor

[ad_1] Image copyright Georgia Institute of Technology Image caption The tsunami came ashore within three minutes of the quake Scientists are getting closer to understanding the tsunami that struck Palu in Indonesia in September. Damaging waves rushed ashore after a Magnitude 7.8 quake, but researchers said at the time that they were surprised by their size. Now, a survey in the bay in front of the Sulawesi city shows significant
Science/Nature

Himalayan and other Asian glaciers put the brakes on

[ad_1] Media playback is unsupported on your device Media captionAmaury Dehecq: "Knowing ice-flow speed allows us to better estimate glacier melt" The glaciers that flank the Himalayas and other high mountains in Asia are moving slower over time. Scientists have analysed nearly 20 years of satellite images to come to this conclusion. They show that the ice streams which have decelerated the most are the ones that have also thinned