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RobertBast, April 26, 2002 at 10:02:00 PM AEST
Bonus neutrinos Neutrinos, previously thought to be massless have been observed in a new way that tells scientists there are probably three times as many emitted form the Sun as previously believed and that they may change from one type to another before reaching Earth.Scientists have long puzzled over why we only receive one-thrid of the neutrinos expected from the Sun. They now know it's because two-thirds of them change into close relatives, the muon and the tau. Interesting numbers - three varieties of neutrino, and equal numbers of each variety arrive here. Perhaps they are in some kind of random quantum state until observed? The articles, at Cosmiverse, BBC, Unisci and AlphaGalileo, don't mention any explanation of what causes the neutrinos to change... This also means that the Universe just got heavier link me RobertBast, April 24, 2002 at 8:28:00 PM AEST Neutron Star 3 Hour "Superburst" NASA scientists have observed a rare thermonuclear explosion on a neutron star that brightened it for so long that they could detect its motion as it moved towards and away from us on its orbit around a companion star.They have observed bursts from this star before, but usually for only 10 seconds, underlining the incredible unpredictability of such objects. ... from NASA or same article with pictures at Cosmiverse link me RobertBast, April 13, 2002 at 5:01:00 PM AEST Very strange new stars Chandra's observations of RXJ1856.5-3754 and 3C58 suggest the matter in the two stars is even denser than nuclear matter found on Earth. This raises the possibility these stars are composed of pure quarks or contain crystals of sub-nuclear particles that normally have only a fleeting existence following high-energy collisions.Previously, the most dense stars were neutron stars. A teaspoonful of neutron star material weighs a billion tons, as much as all the cars, trucks and buses on Earth. More at BBC, VOA, Newsday, Yahoo, CNN and Cosmiverse link me RobertBast, April 10, 2002 at 1:13:06 PM AEST Eros - Why NASA visited 
"It must be a Time Tomb," declared Dr. Dale. Behind sliding panels they had found a world of objects, devices, papers and pictures, and reels upon reels of what looked like magnetic tapes for recording sound and sight. "A complete record of a civilization that discovered space travel long before there was any life on earth!''
NASA give a reasonable explanation as to why they landed on this asteroid last year: Learning what near-Earth asteroids are made of and how they're put together is simply prudent. NASA's NEAR spacecraft did just that when it landed on one in 2001.However, they might be hiding something, as Face on Mars entrepreneur Richard Hoagland explains: This means that Eros meets all the criteria for the "Hall of Records" asteroid depicted in Corbett View Master reel. And it is obviously an object that has been known about for a long time before the Corbett reels were produced.I am usually immune to conspiracy theories, but this one is very convincing (and not very well known!). I implore you to at least take a look at what he has to say... link me RobertBast, April 7, 2002 at 7:16:25 PM AEST Listening to the Sounds of the Sun We've been able to listen to the earth for a while now, but this is more exotic: Studying sound waves inside the Sun has provided new insights into the solar dynamo within, an international team of researchers reports in the journal Science today. They have detected variations in the speed at which different regions of the Sun's interior rotate, observations which appear to be intimately connected with the 11-year cycle of the Sun's magnetic activity and could explain more about how the Sun's colossal magnetic field behaves. ( mirror article ) Monitor the sun via these links link me RobertBast, April 5, 2002 at 4:33:16 PM AEST Supernova caused gamma-ray burst Gamma-ray bursts are the most powerful explosions ever detected in the Universe. They are also one of the greatest mysteries of modern astronomy, since so far no clear evidence has existed to prove what causes them. Until now, there have been two 'prime suspects' for what makes gamma-ray bursts, the collision of neutron stars - dead, ultra-dense stars - or the death of very massive stars in supernova explosions. The new results from the XMM-Newton X-ray space telescope rule out the first hypothesis and confirm the second, at least for the gamma-ray burst that occurred on December 11, 2001. reports ESA However, not all supernovas have produced gamma-ray bursts, and the mechanism of how the burst is actually created is still unknown link me RobertBast, March 24, 2002 at 5:49:47 PM AEDT 3D Galactic centre 
Astronomers using the Gemini North telescope in Hawaii have obtained a three-dimensional picture of the flow of gas and stars at the violent centre of active galaxy NGC 1068, reports the BBC.
The data reveal the internal dynamics of the galaxy and show huge pair of jets hurling material thousands of light-years away from what is probably a black hole at the core. link me RobertBast, March 23, 2002 at 6:28:30 PM AEDT Solar System snooker There may have originally been an extra planet, which lost its spot, burst through the asteroid belt, causing many asteroids to scatter and bombard other planets (and our moon). Astronomy.com reports: "...a body with about half the mass of Mars, originally located about 1.9 AU from the sun, and with an orbital inclination of zero. The planet would slowly be nudged by the other planets into an eccentric orbit which had the planet cross the asteroid belt and then fall into the sun about 600 million years after its creation." It appears that they just ran computer models for ages until something fitted. They seem to have shown that it could of happened, but won't be able to prove that it definitely did. link me RobertBast, March 20, 2002 at 10:59:03 AM AEDT Space radiation worse than thought "Space radiation is one of the most deadly hazards human crews of interplanetary missions face. The Martian Radiation Environment Experiment, known as MARIE, has revealed that space radiation is more intense than scientific models have indicated. Similar instruments are on space shuttles and the international space station, but MARIE is the first radiation detective to travel beyond Earth's magnetosphere....The exposure to the heavy nuclei, up to and including iron nuclei, is "approximately three times" what the astronauts are receiving on the ISS", reports Cosmiverse This means manned flights to Mars will be more risky: "Being away from Earth for three years would mean that every cell of your body would be transversed by a galactic ray, and we just don't know what that would do to people.", reports National Geographic link me RobertBast, March 17, 2002 at 10:35:22 AM AEDT Stealth asteroid "One of the largest asteroids known to have approached the Earth zipped past about 450,000 kilometres away on March 8 - but nobody recorded it until four days later....The object, now called 2002 EM7, was hard to spot because it was moving outward from the innermost point of its orbit, 87 million km from the Sun. When it passed closest to the Earth - just 1.5 times the distance to the Moon - it was too close to the Sun to be visible." Preliminary calculations indicate 2002 EM7 has several chances to hit the Earth in the next century, with odds of one in six million to one in a billion, reports New Scientist. It isn't so rare, says Jim Scotti (University of Arizona), "Simply put, objects the size of the Tunguska impactor pass within the distance that 2002 EM7 did about 25 times every year." Rocks the size of 2002 EM7 come by nearly 100 times a year. link me RobertBast, March 16, 2002 at 9:53:49 PM AEDT Stars shine less brightly "As space ages and expands, fewer and fewer galaxies will be visible to us. Even weirder, as we watch these galaxies fade, their appearance will freeze in time. No matter how long we watch ... they will never grow older or change. They will only grow dimmer as they recede from us", reports Radio Nederland. "Light bulbs, the bright feature of Hong Kong's dramatic skyline, have made the city blind to the wonders of the universe...Astronomers say that time is running out and if nothing's done soon, Hong Kong's night sky will be starless within 10 years", reports CNN. link me RobertBast, March 15, 2002 at 6:09:34 PM AEDT Sun disrupts cell phones "Bursts of energy from the Sun on microwave radio frequencies can disrupt wireless cell communications several times a year, according to scientists who have studied records covering 40 years of such bursts.... The effect of bursts on wireless communications is dependent upon the orientation of cell antennas, with those pointing east-west more susceptible mornings and evenings than at noon." The report will appear in the March-April issue of the journal, Radio Science - details at EurekaAlert and NewsFactor link me RobertBast, March 12, 2002 at 2:29:14 PM AEDT Detonations of rogue stars 
CNN reports that an ancient supernova may have damaged the protective ozone layer around the Earth and wreaked havoc on terrestrial life
link me 2012, March 9, 2002 at 4:35:00 PM AEDT Jupiter's X-rays update 
As mentioned a few weeks ago, mysterious pulsing x-rays are coming from the North Pole of Jupiter. The official NASA report is very interesting. It has an animation and makes statements like:
link me RobertBast, March 4, 2002 at 7:05:54 PM AEDT Serious Planet X proposal MSNBC reports that two sets of researchers have come to the same conclusion - there is a giant planet or failed star in a 4-6 million year orbit around the Sun, 800 times further away than Pluto. When the Space Infrared Telescope Facility is launched next year it might be able to spot it. "Some theorists have proposed that the gravitational effect of a massive unseen object in a distant orbit — nicknamed “Nemesis” or the “Death Star” — could set off periodic cometary storms, which would increase the chances of a catastrophic impact with Earth." link me RobertBast, March 3, 2002 at 9:58:07 PM AEDT Jupiter's X-rays "Using the Chandra X-ray Observatory his team took the most detailed images ever of Jupiter at X-ray wavelengths, and they discovered an auroral "hot spot" that periodically spews out high-energy pulses every 45 minutes. The origin of this X-ray heartbeat has left theorists scrambling to determine its cause." "A pulsating hot spot of X-rays has been discovered in the polar regions of Jupiter's upper atmosphere by NASA's Chandra X-ray Observatory. Previous theories cannot explain either the pulsations or the location of the hot spot, prompting scientists to search for a new process to produce Jupiter's X-rays." "One possibility is that heavy ions among the particles flowing out from the Sun as the solar wind are captured in the outer regions of Jupiter's magnetic field, then accelerated and directed toward its magnetic pole. Once captured, the ions would bounce back and forth in the magnetic field from pole to pole in an oscillating motion that might explain the pulsations." Read on at Chandra & Sky and Telescope link me 2012, March 3, 2002 at 10:19:47 AM AEDT Cosmic Rays on Mars An instrument on NASA's Mars 2001 Odyssey spacecraft has estimated the amount of cosmic rays hitting Mars - so they can determine how unsafe it might be if humans ever land there. Mars has less atmosphere than Earth, and therefore less protection from cosmic rays Mars - Rems per Year On Earth we typically receive 0.05 rems per year. radiation workers have a safety limit or 5 rems per year. Astronauts in space receive roughly 75 rems per year, although a solar flare could deliver 4,000 rems to the skin and 200 rems to internal organs in a single deadly dose. On Mars a human would receive between 10 & 20 rems per year. Mars - Hits per Cell Nucleus The estimated average number of times per year each cell nucleus in a human there would be hit by a high-energy cosmic ray particle. On Mars it is between 2 & 8 hits per cell nucleus per year. link me RobertBast, February 28, 2002 at 8:18:44 PM AEDT Enormous X-ray jet Chandra observations of quasar PKS 1127-145, revealed an X-ray jet that extends over a length of at least a million light years.The source is a super-massive black hole.
link me RobertBast, February 27, 2002 at 4:37:24 PM AEDT Giant Teardrop Astronomers have found a weird double-star system -- a super-fast spinning pulsar whose gravity has deformed its companion star into a giant red teardrop - the first time this phenomenon has been observed, reports UniSci link me 2012, February 25, 2002 at 10:04:27 AM AEDT (In)Active Galactic Nuclei The Milky Way's black hole (in the galactic centre) is unusually quiet - is a supernova from 10,000 years ago the reason?
"Ten thousand years ago a supernova exploded very close to Sagittarius A*. The fast-expanding gases swept away much of the local interstellar gas and dust, preventing material from falling into the Milky Way's supermassive black hole, thereby starving it. Less material falling into the black hole meant fewer X-rays being emitted" But then again, could it more like a dormant volcano. In 2001: "Sagittarius A* suddenly brightened. Within minutes it was 45 times its normal intensity. Then it faded back to its pre-flare level about three hours later". link me |
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