Four pairs of what astronomers are calling “impossible stars” — stellar twins in orbits so close they defy explanation — have been found in our Milky Way galaxy, scientists say. Astronomers using the United Kingdom Infrared Telescope in Hawaii discovered the four star pairs, each of which is a binary system in which two stars…
Polar and brown bears diverged between 4 million and 5 million years ago, but they continued to interbreed when the climate warmed. Now, there is evidence that it is happening again.
It’s assumed that modern humans, Homo sapiens, originated in Africa sometime between 200,000 and 100,000 years ago. But paleoanthropologist Tim Weaver argues there might be another way to interpret our species’ beginnings. Instead of a discrete origin event, he suggests in the Journal of Human Evolution that our ancestors’ arrival into the world might have…
Scientists attempting to better understand the formation and the present-day layering of planet Earth have turned to ancient meteorites — meteorites which they say could hold important clues to some of the Solar System’s earliest chemical processes. Those meteorites are known as diogenites, and researchers from the Carnegie Institution, the Scripps Institution of Oceanography, and…
Modern humans were likely a greater threat to the Neanderthals than major natural events like extreme cold weather or volcanoes, according to British-led research. The study, published in the Proceedings of the National Academy of Sciences, was based on an analysis of volcanic ash that showed the largest known eruption in Europe came after traces…
An international team of researchers has provided the first molecular evidence that Neanderthals not only ate a range of cooked plant foods, but also understood its nutritional and medicinal qualities. Until recently Neanderthals, who disappeared between 30,000 and 24,000 years ago, were thought to be predominantly meat-eaters. However, evidence of dietary breadth is growing as…
Astronomers have spotted the earliest known spiral galaxy, dating to just three billion years after the Big Bang. Theories of galaxy formation held that the Universe was still too chaotic a place to allow such a perfectly formed or “grand-design” spiral to form. It should take far longer for gravity to bring matter into thin,…
Thirty-three light-years away, in the constellation Leo the lion, astronomers say they have found a world considerably smaller than Earth, orbiting a dim red-dwarf star. That’s something to think about. While scientists have confirmed the existence of more than 700 so-called exoplanets since 1995, most of them have been giant — many considerably larger than…
The word “house” generally conjures images of rectangular dwellings with front porches and chimneys. Front lawns and garages too. But fast forward a few hundred years and the traditional four walls and a roof won’t be standard housing fare, according to urban experts. Climate change, population growth and geo-political shifts are already redefining the way…
Astronomers have made a crucial step towards a scientific goal by observing the heart of a distant quasar with angular resolution. An international team of astronomers connected radio telescopes in Chile, Hawaii and Arizona for the first time using the technique of Very Long Baseline Interferometry, enabling them to make the sharpest observation ever of…