Even though the black hole at the center of the Milky Way is a monster, it’s still rather quiet. Called Sagittarius A*, it’s about 4.6 million times more massive than our Sun. Usually, it’s a brooding behemoth. But scientists observing Sgr. A* with the Keck Telescope just watched as its brightness bloomed to over 75 times normal for ...
Stone tools uncovered in Mongolia by an international team of archaeologists indicate that modern humans traveled across the Eurasian steppe about 45,000 years ago, according to a new University of California, Davis, study. The date is about 10,000 years earlier than archaeologists previously believed that humans migrated to Mongolia. The site also points to a ...
A renegade star exploding in a distant galaxy has forced astronomers to set aside decades of research and focus on a new breed of supernovae that can utterly annihilate its parent star — leaving no remnant behind. The signature event, something astronomers had never witnessed before, may represent the way in which the most supermassive ...
If you put a Moon rock alongside one from Earth, they usually don’t have a lot in common. So when Curtin University planetary scientist Professor Alexander Nemchin looked closely at a Moon rock in his laboratory, he realized something wasn’t right. The Moon rock’s composition was similar to granite, which is extremely rare on the ...
A group of astronomers, including Penn State scientists, has announced the likely discovery of a highly obscured black hole existing only 850 million years after the Big Bang, using NASA’s Chandra X-ray Observatory. This is the first evidence of a cloaked black hole at such an early time. Black holes produce quasars Supermassive black holes ...
A team from University College Dublin has unearthed almost 40 previously unknown monuments close to Newgrange, including a “spectacular” monument that aligns with the winter solstice sunrise. The findings likely range from the Neolithic period (4000 B.C.), through the Bronze Age (2500 B.C.), and the early Middle Ages. The monument aligned with the winter solstice ...
How do galaxies such as our Milky Way come into existence? How do they grow and change over time? The science behind galaxy evolution has remained a puzzle for decades. Still, a University of Arizona-led team of scientists is one step closer to finding answers thanks to supercomputer simulations. Observing real galaxies in space can ...
When small, dense stars called white dwarfs explode, they produce bright, short-lived flares called Type Ia supernovae. These supernovae are informative cosmological markers for astronomers — for example, they were used to prove that the universe is accelerating in its expansion. White dwarfs are not all the same, ranging from half of the mass of ...
Astronomers are planning to hunt for cores of exoplanets around white dwarf stars by “tuning in” to the radio waves that they emit. In new research led by the University of Warwick, scientists have determined the best candidate white dwarfs to start their search, based on their likelihood of hosting surviving planetary cores and the ...
Charcoal produced by wildfires could trap carbon for hundreds of years and help mitigate climate change, according to new research just published. The extensive and unprecedented outbreak of wildfires in the arctic and the vast amounts of CO2 they are emitting have been hitting the headlines across the world. But a new Nature Geoscience study ...
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