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عناوین یادداشت‌ها

  • Earliest Stars Came in Pairs, New Simulation Shows جمعه 19 تیر‌ماه سال 1388 19:34
    Most stars exist in binary pairs today — and new research indicates that may have been true for a very long time. This simulation of a primordial star forming region about 200 million years after the Big Bang shows two pre-stellar cores of more than five times the mass of the sun each. The cores formed at a separation...
  • Beautiful Chaos جمعه 19 تیر‌ماه سال 1388 19:33
    Can you imagine living in this region of space? Just think of the beautiful views you'd have in the sky – that is, if you survived the chaos as one galaxy is passing through the core of three other galaxies at ridiculous (ludicrous?) speeds (3.2 million km per hour / 2 million miles per hour ) generating a shock wave...
  • NASA Science News for July 10, 2009 جمعه 19 تیر‌ماه سال 1388 19:28
    When astronauts travel through space, the human heart loses something it seems to need: the Earthly pull of gravity. Is this a problem? NASA is launching a new study to find out. FULL STORY at http://science.nasa.gov/headlines/y2009/10jul_cardio.htm?list1035898
  • NASA Science News for July 9, 2009 جمعه 19 تیر‌ماه سال 1388 19:27
    Amateur astronomers have photographed NASA's LCROSS spacecraft en route to an October crash landing on the Moon . Observers say the spacecraft is surprisingly easy to photograph, and NASA hopes more amateurs will give it a try. FULL STORY at http://science.nasa.gov/headlines/y2009/09jul_lcross1.htm?list1035898
  • Going to Mars Together جمعه 19 تیر‌ماه سال 1388 19:26
    From the "this makes complete sense" department: NASA and ESA have established an initiative to make future explorations of Mars a joint venture. The ESA Director of Science and Robotic Exploration, David Southwood, met with NASA’s Associate Administrator for Science, Ed Weiler at the end of June and created...
  • New Technique Finds Farthest Supernovae جمعه 19 تیر‌ماه سال 1388 19:25
    Two of the farthest supernovae ever detected have been found by using a new technique that could help find other dying stars at the edge of the universe . The two cosmic blasts occurred 11 billion years ago. The next-farthest large supernova known occurred about 6 billion years ago. Jeff Cooke from the University of...
  • Observing Alert! Outburst of Dwarf Nova WX Ceti جمعه 19 تیر‌ماه سال 1388 19:24
    According to AAVSO Special Notice #161 posted today by M. Templeton, dwarf nova WX Ceti is now in outburst and has been recorded at magnitude 12.62. There's a lot to be learned about this cool little star… (...) Read the rest of Observing Alert! Outburst of Dwarf Nova WX Ceti (703 words)
  • Omega Nebula Struts its Stuff in New, Multicolored Image جمعه 19 تیر‌ماه سال 1388 19:21
    The Omega Nebula , a stellar nursery 5500 light-years away towards the constellation Sagittarius (the Archer), is looking positively dashing in this new image released today by the European Organisation for Astronomical Research in the Southern Hemisphere (ESO). The subtle color shades across the three-color composite...
  • How Often Are New Stars Born in the Milky Way? جمعه 19 تیر‌ماه سال 1388 19:20
    Stellar nurseries can be found in giant clouds of molecular gas and dust scattered throughout our galaxy . The Octo-mom has nothing on these stellar nurseries, as these regions can produce multiple stars at once – into the hundreds at a time. How often does this happen? On average, one new star is born somewhere in...
  • Phoenix Lander Team: It Snows at Night on Mars یکشنبه 14 تیر‌ماه سال 1388 22:10
    It snows on Mars. This occurs, at least in the northern arctic region where the Phoenix lander set up camp in 2008. Science teams from Phoenix were able to observe water-ice clouds in the Martian atmosphere and precipitation that fell to the ground at night and sublimate into water in the morning. James Whiteway and...
  • By Gamma-Rays Alone: Fermi Raises the Curtain on 16 New Pulsars یکشنبه 14 تیر‌ماه سال 1388 22:08
    For the first time, NASA’s Fermi Gamma-ray Space Telescope has spotted a new group of pulsars using only their gamma-ray emissions, in the absence of radio signals beamed to Earth . The 16 new objects are reported in this week's edition of Science Express , in a study based out of the University of California in Santa...
  • Perchlorates and Water Make for Potential Habitable Environment یکشنبه 14 تیر‌ماه سال 1388 22:06
    This mosaic assembled from Phoenix images show the spacecraft's three landing legs. Splotches of Martian material on the landing leg strut at left could be liquid saline-water. Click for larger version on Spaceflightnow. com Credit: Kenneth Kremer, Marco Di Lorenzo, NASA/JPL/UA/Max Planck Institute and...
  • Fly Me To The Moon… یکشنبه 14 تیر‌ماه سال 1388 22:01
    "Fly me to the Moon and let me play among the stars … Let me see what life is like on…" Oh, hi there! I'll just bet you know what's up with the double image, don't you? That's right. A little "stereo magic" by Jukka Metsavainio. But this time you're in for something really different. Step inside...
  • Faster, Cheaper (and Better?) Way to the Moon یکشنبه 14 تیر‌ماه سال 1388 22:01
    The word this morning from several NASA Twitterers is that the stacking of the new Ares I-X rocket for its upcoming test flight is temporarily on hold. Everyone is waiting for word from a NASA executive session reconsidering the plan. And perhaps it might have something to do with an alternative plan to return to the...
  • Your New Guide to the Inner Galaxy یکشنبه 14 تیر‌ماه سال 1388 22:00
    All you galactic hitchhikers take note: a new atlas of the inner regions of the Milky Way was released today, showing thousands of previously undiscovered dense knots of cold cosmic dust — the potential birthplaces of new stars . This new map of the home galaxy was made using observations from the APEX telescope in...
  • Astronomers Discover Medium-Sized Class of Black Holes یکشنبه 14 تیر‌ماه سال 1388 21:59
    It's the Goldilocks variety of black holes : not too big and not too small. The new source HLX-1, the light blue object to the top left of the galactic bulge, is the ambassador for a new class of black holes, more than 500 times the mass of the Sun . It lies on the periphery of the edge-on spiral galaxy ESO 243-49,...
  • Device Makes Radio Waves Travel Faster Than Light یکشنبه 14 تیر‌ماه سال 1388 21:56
    Polarization Synchrotron . Credit: Singleton, et al., via Current.com A scientist has created a gadget that can make radio waves travel faster than light. Einstein predicted that particles and information can't travel faster than the speed of light , but phenomena like radio wav es are a different story, said John...
  • Landforms Indicate یکشنبه 14 تیر‌ماه سال 1388 21:53
    Retrogressive scarps with cuspate niches, long branching spurs and associated fluvial-like tributary channels. Credit:NASA/JPL/UofA Remember the polygon-shaped landforms at Mars north polar region that the Phoenix lander studied? The polygons are produced by seasonal expansion and contraction of ground ice, and these...
  • Book Review: How To Live On Mars یکشنبه 14 تیر‌ماه سال 1388 21:50
    With all the probes recently landing on Mars, it's no wonder we feel that the planet is close enough to vacation there. Robert Zubrin has such a scheme already in place for his book entitled " How to Live on Mars – A Trusty Guidebook to Surviving and Thriving on the Red Planet ". Though vacationers are...
  • NASA Science News for July 3, 2009 یکشنبه 14 تیر‌ماه سال 1388 21:45
    The International Space Station (ISS) is about to make a remarkable series of flybys over the United States. Beginning this 4th of July weekend, the station will appear once, twice, and sometimes three times a day for many days in a row. FULL STORY at...
  • NASA Science News for June 26, 2009 یکشنبه 14 تیر‌ماه سال 1388 21:44
    Astronauts are looking forward to an unprecedented view of the cosmos when the largest window ever built for space is installed on the International Space Station . FULL STORY at http://science.nasa.gov/headlines/y2009/26jun_cupola.htm?list1035898
  • NASA Science News for June 19, 2009 یکشنبه 14 تیر‌ماه سال 1388 21:42
    In the aftermath of a recent, deadly earthquake, the NASA-led SERVIR program orchestrated use of satellite data to show Central American disaster officials where help was needed most. FULL STORY at http://science.nasa.gov/headlines/y2009/18jun_servir.htm?list1035898
  • NASA Science News for June 17, 2009 یکشنبه 14 تیر‌ماه سال 1388 21:39
    Where have all the sunspots gone? Scientists studying a jet stream deep inside the sun may have found the answer. FULL STORY at http://science.nasa.gov/headlines/y2009/17jun_jetstream.htm?list1035898
  • NASA Science News for June 15, 2009 یکشنبه 14 تیر‌ماه سال 1388 21:37
    With NASA poised to launch the world's most famous treadmill (COLBERT) to the International Space Station , an astronaut describes what it's like to run in space where sweat floats and there is no gravity to hold your feet to the ground. FULL STORY at...
  • First Extra-Galactic Planet May Have Been Detected شنبه 23 خرداد‌ماه سال 1388 17:38
    Panel on the right shows The upper panel shows the simulated light curve (black dots) of a planetary event in M31. Credit: Ingrosso, et al. Using a technique called Pixel-lensing, a group of astronomers in Italy may have detected a planet orbiting another star . But this planet is unique among the 300-plus exoplanets...
  • Astronomers Announce First Newborn Stars at Milky Way’s Core شنبه 23 خرداد‌ماه سال 1388 17:37
    The Galactic Center . Credit: Suzan Stolovy (SSC/Caltech), JPL-Caltech, NASA Astronomers have found the first evidence of newborn stars at the center of the Milky Way , a region once thought to be inhospitable to the formation of new stars. Solange Ramirez, the principal investigator of the research program at NASA’s...
  • Lunar, Solar Eclipses Hold Secrets to Other Worlds شنبه 23 خرداد‌ماه سال 1388 17:36
    Total Lunar Eclipse , 2004. Credit: Fred Espenak Want to know about the atmospheres of planets around other stars , and the stars themselves? Start at home. A pair of papers in this week’s issue of Nature is advocating continued studies of both lunar eclipses , when the Moon transits Earth ’s shadow, and solar...
  • Where In The Universe #57 شنبه 23 خرداد‌ماه سال 1388 17:31
    Are you ready for another Where In The Universe Challenge? Take a look and see if you can name where in the Universe this image is from. Give yourself extra points if you can name the spacecraft responsible for the image. As usual, we’ll provide the image today, but won’t reveal the answer until tomorrow. This gives...
  • New Technique Reveals Ages of Millisecond Pulsars شنبه 23 خرداد‌ماه سال 1388 17:23
    Astronomers have developed a new technique to accurately determine the ages of millisecond pulsars , the fastest-spinning stars in the universe. The standard method for estimating pulsar ages is known to yield unreliable results, especially for the fast-spinning millisecond pulsars, said Bülent Kiziltan, a graduate...
  • “Dark” Gamma-Ray Bursts Shed Light on Star Formation شنبه 23 خرداد‌ماه سال 1388 17:20
    Thanks to the Swift satellite and several ground based optical telescopes , astronomers are learning more about so-called “dark” gamma-ray bursts, which are bright in gamma- and X-ray emissions but with little or no visible light. These dark bursts are also providing astronomers with insights on finding areas of star...