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NASA's Jet Propulsion Laboratory News and Features 24 Apr 2017, 18:16 UTC
NASA's Goddard Space Flight Center 24 Apr 2017, 15:00 UTC
CERN 24 Apr 2017, 15:00 UTC In a paper published today in Nature Physics (link is external), the ALICE collaboration reports that proton collisions sometimes present similar patterns to those observed in the collisions of heavy nuclei. This behaviour was spotted through observation of so-called strange hadrons in certain proton collisions in which a large number of particles are created. Strange hadrons are well-known particles with names such as Kaon, Lambda, Xi and Omega, all containing at least one so-called strange quark. The observed ‘enhanced production of strange particles’ is a familiar feature of quark-gluon plasma, a very hot and dense state of matter that existed just a few millionths of a second after the Big Bang, and is commonly created in collisions of heavy nuclei. But it is the first time ever that such a phenomenon is unambiguously observed in the rare proton collisions in which many particles are created. This result is likely to challenge existing theoretical models that do not predict an increase of strange particles in these events.
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Starts With a Bang! 25 Apr 2017, 14:01 UTC In science, you don’t have to get everything right in order to get the most incredible things correct. Sometimes good ideas emerge from a failed paradigm. An excellent example of both is the groundbreaking stellar nucleosynthesis paper (creation of complex nuclei from simpler ones) paper, published in 1957, known simply as B2FH, after the initials of the four authors. For the first time, it offered a successful model of element formation. It was designed to avoid the need for a Big Bang, and to support an alternative explanation called Steady State theory. Today, while Steady State theory is a relic of the past, stellar nucleosynthesis complements the Big Bang theory in a successful, comprehensive explanation of how all of the elements in the universe were built from elementary particles.
New Scientist 25 Apr 2017, 11:21 UTC Mars has an asteroid entourage, with nine so-called Trojans trailing in its wake. Now it seems these travelling companions all had the same violent beginning: as the innards of a mini-planet, eviscerated in a violent collision. Some remnants may even have been incorporated into the material that became Mars. Trojans are distinct from the asteroids found in the asteroid belt, which begins about 101 million kilometres past Mars and stretches toward Jupiter. While Trojans orbit the sun, like the asteroid belt, they are trapped in gravitational sweet spots that ensure they will permanently trail or precede the planet in its trip around our star. These are known as Lagrange points.
Universe Today 25 Apr 2017, 03:03 UTC NASA astronaut Peggy Whitson, currently living and working aboard the International Space Station, broke the record Monday for cumulative time spent in space by a U.S. astronaut – an occasion that was celebrated with a phone call from President Donald Trump, First Daughter Ivanka Trump, and fellow astronaut Kate Rubins. Credits: NASA TV NASA Astronaut Peggy Whitson set the endurance record for time in space by a U.S, astronaut today, Monday, April 24, during her current stint of living and working aboard the International Space Station (ISS) along with her multinational crew of five astronauts and cosmonauts. Furthermore Whitson received a long distance phone call of exuberant congratulations from President Donald Trump, First Daughter Ivanka Trump, and fellow astronaut Kate Rubins direct from the Oval Office in the White House to celebrate the momentous occasion. “This is a very special day in the glorious history of American spaceflight!” said President Trump during the live phone call to the ISS broadcast on NASA TV. As of today, Whitson exceeded 534 cumulative days in space by an American astronaut, breaking the record held by NASA astronaut Jeff Williams. “Today Commander Whitson you have broken the record for the most total time spent ...