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POPSQuiet Explosion: Object Intermediate Between Normal Supernovae And Gamma-ray Bursts Found Stars that were at birth more massive than about 8 times the mass of our Sun end their relatively short life in a cosmic, cataclysmic firework lighting up the Universe. The outcome is the formation of the densest objects that exist, neutron stars and black holes. When exploding, some of the most massive stars emit a short cry of agony, in the form of a burst of very energetic light, X- or gamma-rays.
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POPSBritain releases files on UFO sightings
The National Archives is releasing the files because of numerous freedom of information requests seeking information about the government's UFO reports. Officials said that names of many individuals had been blacked out to protect their privacy and that the entire files had been reviewed to make sure their release did not compromise national security. Ministry of Defense officials indicate in the files that UFO reports were only investigated to make sure no enemy aircraft had illegally entered British airspace. This was crucial during the Cold War when Russian planes posed a threat. Officials said they did not try to solve UFO riddles once an enemy attack had been ruled out. The vast majority of UFO reports come from members of the public who see strange things in the sky and jump to the conclusion that a UFO is involved even though there are logical explanations for what they observe, experts said. "The most common things are aircraft lights, bright stars and planets, sate
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POPSNew twist to matter-antimatter mystery Here is an "almost breakthrough" A major mystery of modern physics is why normal matter particles are the building blocks of the observable universe. Why are we not made of antimatter? Or pure energy? Scientists speculate that a tiny imbalance in the early universe allowed a small fraction of normal matter – one particle for every one billion – to avoid annihilation and survive to form stars, planets, and humans. When we come to know that we don't know, there is a new place for hope...
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POPSSupermassive black hole says sayonara "In their study, Stefanie Komossa and her colleagues at the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, examined the spectrum of light from a quasar, a brilliant beacon with the unwieldy name SDSS J092712.65+294344.0. Quasars, which lie at the center of galaxies, are fueled by black holes. An analysis of the quasar spectrum reveals a pattern of light emission that matches that expected from a supermassive black hole shot out of the galaxy’s center, the team reports in the May 10 Astrophysical Journal Letters."
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POPSMilky Way twice as thck as we think. It's funny that they discovered this by downloading publicly available data on the internet and checking the figures. They had the results in a few hours. I'm not sure whether we should feel bigger or smaller, but when I go out tonight the sky will look the same as it ever did.
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POPSIs Time disappearing from the universe? At an everyday level, the change would not be perceptible. However, it would be obvious from cosmic scale measurements tracking the course of the universe over billions of years. The change would be infinitesimally slow from a human perspective, but in terms of the vast perspective of cosmology, the study of ancient light from suns that shone billions of years ago, it could easily be measured Difficult to fathom.
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POPSWeird dark stars dotted early universe Quasars usually need the mass of a galaxy to form, and astronomers have been unable to explain how some quasars seemed to appear before galaxies had formed to make them. These 'dark stars' provide a means by which this may have happened.
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POPSMultiverse theory Ops! The first part of this clip-universe has strange characteristic – it is invisible. You have to press “Ctrl+A” (select all) to see this part. Sorry for inconvenience.
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