Galileo Satellites Are Experiencing Multiple Clock Failures

elgatozorbas writes: According to a BBC article, the onboard atomic clocks that drive the satellite-navigation signals on Europe’s Galileo network have been failing at an alarming rate. From the report: “Across the 18 satellites now in orbit, nine cloc…

elgatozorbas writes: According to a BBC article, the onboard atomic clocks that drive the satellite-navigation signals on Europe’s Galileo network have been failing at an alarming rate. From the report: “Across the 18 satellites now in orbit, nine clocks have stopped operating. Three are traditional rubidium devices; six are the more precise hydrogen maser instruments that were designed to give Galileo superior performance to the American GPS network. Each Galileo satellite carries two rubidium and two hydrogen maser clocks. The multiple installation enables a satellite to keep working after an initial failure. All 18 spacecraft currently in space continue to operate, but one of them is now down to just two clocks. Most of the maser failures (5) have occurred on the satellites that were originally sent into orbit to validate the system, whereas all three rubidium stoppages are on the spacecraft that were subsequently launched to fill out the network. Esa staff at its technical centre, ESTEC, in the Netherlands are trying to isolate the cause the of failures – with the assistance of the clock (Spectratime of Switzerland) and satellite manufacturers (Airbus and Thales Alenia Space; OHB and SSTL). It is understood engineers have managed to restart another hydrogen clock that had stopped. It appears the rubidium failures ‘all seem to have a consistent signature, linked to probable short circuits, and possibly a particular test procedure performed on the ground.'”

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Japanese Spacecraft Spots Massive Gravity Wave In Venus’ Atmosphere

An anonymous reader quotes a report from The Verge: The Japanese probe Akatsuki has observed a massive gravity wave in the atmosphere of Venus. This is not the first time such a wave was observed on the Solar System’s second planet, but it is the large…

An anonymous reader quotes a report from The Verge: The Japanese probe Akatsuki has observed a massive gravity wave in the atmosphere of Venus. This is not the first time such a wave was observed on the Solar System’s second planet, but it is the largest ever recorded, stretching just over 6,000 miles from end to end. Its features also suggest that the dynamics of Venus’ atmosphere are more complex than previously thought. An atmospheric gravity wave is a ripple in the density of a planet’s atmosphere, according to the European Space Agency. Akatsuki spotted this particular gravity wave, described in a paper published today in Nature Geoscience, when the probe arrived at the planet on December 7th, 2015. The spacecraft then lost sight of it on December 12th, 2015, because of a change in Akatsuki’s orbit. When the probe returned to a position to observe the bow-shaped structure on January 15th, 2016, the bright wave had vanished. What sets the huge December wave apart from previously discovered ones is that it appeared to be stationary above a mountainous region on the planet’s surface, despite the background atmospheric winds. The study’s authors believe that the bright structure is the result of a gravity wave that was formed in the lower atmosphere as it flowed over the planet’s mountainous terrain. It’s not clear how the wave exactly propagates to the planet’s upper atmosphere, where clouds rotate faster than the planets itself — four days instead of the 243 days it takes Venus to rotate once.

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SpaceX Returns To Flight, And Nails Another Drone Landing

Applehu Akbar writes: SpaceX successfully launched a 10-satellite Iridium NEXT package, and then landed on a drone ship — this time from Vandenburg AFB in California. The launch had been delayed several days by this week’s record rainfall and flo…

Applehu Akbar writes: SpaceX successfully launched a 10-satellite Iridium NEXT package, and then landed on a drone ship — this time from Vandenburg AFB in California. The launch had been delayed several days by this week’s record rainfall and flooding.

CNN has video of the launch, and points out its obvious significance. “Because rockets are worth tens of millions of dollars, and they have historically been discarded after launch, mastering the landing is key to making space travel more affordable… Saturday’s launch marks the seventh time SpaceX has successfully landed a rocket.”

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Scientists Predict Star Collision Visible To The Naked Eye In 2022

Scientists predict that a pair of stars in the constellation Cygnus will collide in 2022, give or take a year, creating an explosion in the night sky so bright that it will be visible to the naked eye. From a report on NPR: If it happens, it would be t…

Scientists predict that a pair of stars in the constellation Cygnus will collide in 2022, give or take a year, creating an explosion in the night sky so bright that it will be visible to the naked eye. From a report on NPR: If it happens, it would be the first time such an event was predicted by scientists. Calvin College professor Larry Molnar and his team said in a statement that two stars are orbiting each other now and “share a common atmosphere, like two peanuts sharing a single shell.” They predict those two stars, jointly called KIC 9832227, will eventually “merge and explode … at which time the star will increase its brightness ten thousand fold becoming one of the brighter stars in the heavens for a time.” That extra-bright star is called a red nova. They recently presented their research at a meeting of the American Astronomical Society in Grapevine, Texas.

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SpaceX Gets the Green Light To Resume Rocket Launches

Elon Musk’s SpaceX rocket company has been cleared to resume flying following a launch pad explosion four months ago, the U.S. Federal Aviation Administration said on Friday. From a report on Fortune: The decision clears SpaceX to attempt to launch a F…

Elon Musk’s SpaceX rocket company has been cleared to resume flying following a launch pad explosion four months ago, the U.S. Federal Aviation Administration said on Friday. From a report on Fortune: The decision clears SpaceX to attempt to launch a Falcon 9 rocket carrying 10 Iridium Communications satellites as early as Monday, a day later than originally planned. SpaceX, owned by Tesla Motors Chief Executive Officer Musk, on Friday declined to comment about what caused the delay. Liftoff from Vandenberg Air Force Base in California is targeted for around 10:26 a.m. PST/1:26 p.m. EST. The FAA, which oversees commercial U.S. space launches, oversaw SpaceX’s investigation into why a Falcon 9 rocket burst into flames on a launch pad in Florida as it was being fueled for a routine, prelaunch test on Sept. 1. The accident destroyed the $62 million booster and a $200 million Israeli communications satellite that had been partly leased by Facebook to expand Internet access in Africa.

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SpaceX Moves Past Explosion With New Launch Plans

SpaceX plans to resume launching rockets as soon as next week, after completing an investigation into a spectacular launch pad explosion that destroyed a rocket and a satellite in September. From a report on CNN: The news comes following an in-depth in…

SpaceX plans to resume launching rockets as soon as next week, after completing an investigation into a spectacular launch pad explosion that destroyed a rocket and a satellite in September. From a report on CNN: The news comes following an in-depth investigation into the explosion of a rocket from SpaceX’s September mission. The company said in a statement Monday the botched launch was due to a failed pressure vessel in a liquid oxygen tank. The vessel buckled, causing liquid oxygen to accumulate. It believes this led to friction, sparks and the explosion. SpaceX conducted the investigation along with officials from NASA, the Federal Aviation Authority, the U.S. Air Force and the National Transportation Safety Board. The Federal Aviation Administration will have to sign off on the report and issue SpaceX a license to launch. SpaceX appears optimistic it will be launching rockets again soon.

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Astronomers Detect Mysterious Radio Signals Coming From Outside Our Galaxy

This week the New York Post reported on “powerful radio signals which have been detected repeatedly in the same exact location in space,” generating as much energy as the sun does in a whole day, in “the only known instance in which these signals have …

This week the New York Post reported on “powerful radio signals which have been detected repeatedly in the same exact location in space,” generating as much energy as the sun does in a whole day, in “the only known instance in which these signals have been found twice in the same location in space.” Slashdot reader schwit1 quotes Science Alert:
Back in March, scientists detected 10 powerful bursts of radio signals coming from the same location in space. And now researchers have just picked up six more of the signals seemingly emanating from the same region, far beyond our Milky Way… Currently, the leading hypothesis for the source of the Milky Way’s FRB is the cataclysmic collision of two neutron stars, which forms a black hole. The idea is that as this collision happens, huge amounts of short-lived radio energy are blasted out into space. But the repeating nature of these distant signals, all coming from the same place, suggest that can’t be the case… the most likely hypothesis at the moment for these outer-galactic FRB is that they’re coming from an exotic object such as a young neutron star, that’s rotating with enough power to regularly emit the extremely bright pulses.
But the New York Post thinks it’s aliens.

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Vera Rubin, Pioneering Astronomer Who Confirmed Existence of Dark Matter, Dies At 88

Mikkeles quotes a report from CBC.ca: Vera Rubin, a pioneering astronomer who helped find powerful evidence of dark matter, has died, her son said Monday. She was 88. Vera Rubin found that galaxies don’t quite rotate the way they were predicted, and th…

Mikkeles quotes a report from CBC.ca: Vera Rubin, a pioneering astronomer who helped find powerful evidence of dark matter, has died, her son said Monday. She was 88. Vera Rubin found that galaxies don’t quite rotate the way they were predicted, and that lent support to the theory that some other force was at work, namely dark matter. Rubin’s scientific achievements earned her numerous awards and honors, including a National Medal of Science presented by then-president Bill Clinton in 1993 “for her pioneering research programs in observational cosmology.” She also became the second female astronomer to be elected to the National Academy of Sciences.

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John Glenn, First American To Orbit The Earth, Dies At 95

BenBoy writes: John Herschel Glenn Jr. (July 18, 1921 — December 8, 2016) was an American aviator, engineer, astronaut, and United States Senator from Ohio. He was one of the “Mercury Seven” group of military test pilots selected in 1959 by NASA to be…

BenBoy writes: John Herschel Glenn Jr. (July 18, 1921 — December 8, 2016) was an American aviator, engineer, astronaut, and United States Senator from Ohio. He was one of the “Mercury Seven” group of military test pilots selected in 1959 by NASA to become America’s first astronauts and fly the Project Mercury spacecraft. He passed away today at age 95.

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John Glenn, First American To Orbit The Earth, Dies At 95

BenBoy writes: John Herschel Glenn Jr. (July 18, 1921 — December 8, 2016) was an American aviator, engineer, astronaut, and United States Senator from Ohio. He was one of the “Mercury Seven” group of military test pilots selected in 1959 by NASA to be…

BenBoy writes: John Herschel Glenn Jr. (July 18, 1921 — December 8, 2016) was an American aviator, engineer, astronaut, and United States Senator from Ohio. He was one of the “Mercury Seven” group of military test pilots selected in 1959 by NASA to become America’s first astronauts and fly the Project Mercury spacecraft. He passed away today at age 95.

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