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عناوین یادداشت‌ها

  • Happy Nowruz یکشنبه 1 فروردین‌ماه سال 1389 17:29
    Happy Nowruz to you
  • Astronomy Without A Telescope – How To Impress An Alien (Or Not) یکشنبه 1 فروردین‌ماه سال 1389 17:21
    Aerial view of the 300 metre diameter Arecibo radio telescope dish It's about fifty years since Frank Drake sent out our first chat request to the wider universe . I say about as I think the official date is 11 April 1960 – but I notice a lot of fifty year anniversary blogs and interviews are already being published,...
  • Weekend SkyWatcher's Forecast: March 19-21, 2010 یکشنبه 1 فروردین‌ماه سال 1389 17:17
    Greetings, fellow SkyWatchers! As one hemisphere warms, another cools… and so our passion for astronomy can sometimes wax and wane. Why not rekindle your viewing spirit by enjoying some lunar targets this weekend? If you don't think identifying lunar features with a small pair of binoculars is exciting – then think on...
  • Equinox Sky Show یکشنبه 1 فروردین‌ماه سال 1389 17:14
    NASA Science News for March 19, 2010 Grab your binoculars. The crescent Moon and the Pleiades star cluster are gathering for a beautiful close encounter on the first night of northern Spring. FULL STORY at http://science.nasa.gov/headlines/y2010/19mar_equinox.htm?list1035898
  • Finally, a یکشنبه 1 فروردین‌ماه سال 1389 17:13
    Artist’s impression of Corot-9b. Credit: ESO/L. Calçada Chalk up another exoplanet discovery for the CoRoT satellite. But this planet , while a gas giant , could have temperatures cool enough to host liquid water. Corot-9b orbits a sun -like star at a distance similar to Mercury – one of the largest orbits of any...
  • Secret Mini Space Shuttle Could Launch April 19 یکشنبه 1 فروردین‌ماه سال 1389 17:12
    Illustration of the X-37 Advanced Technology Demonstrator during flight. Credit: NASA It's cute. It's little. It's also top secret. The X-37B orbital test vehicle is at Cape Canaveral in Florida , and the word is that it will be launched on board an Atlas V rocket on Monday April 19, 2010 at around 10 pm EDT. Other...
  • The Multiplying Mystery of Moonwater یکشنبه 1 فروردین‌ماه سال 1389 17:09
    NASA Science News for March 18, 2010 Researchers who once confidently stated that the Moon was bone-dry are now thinking the unthinkable: The Moon has so much water, there's actually a "lunar hydrosphere." International spacecraft have recently discovered no fewer than three "flavors" of moonwater...
  • Did the Chilean Quake Shift Earth's Axis? یکشنبه 1 فروردین‌ماه سال 1389 17:03
    NASA Science News for March 11, 2010 Widespread press reports have noted that February's Chilean earthquake might have shortened Earth's day by a small amount. Today's story from Science@NASA explores a more significant effect---how the quake might have shifted Earth's axis. FULL STORY at...
  • Spirit's Journey to the Center of Mars یکشنبه 1 فروردین‌ماه سال 1389 16:58
    NASA Science News for February 24, 2010 NASA's venerable Mars rover Spirit is starting a second career as an explorer of the Martian core--but first it must survive the perilous Martian winter. FULL STORY at http://science.nasa.gov/headlines/y2010/24feb_martiancore.htm?list1035898
  • The Coma Berenicid Meteor Shower Peaks سه‌شنبه 29 دی‌ماه سال 1388 14:39
    Awake during the wee hours of the morning? Try heading outdoors for awhile to watch for the "guess-timated" peak of the Coma Berenicid meteor shower on the morning of January 19 . It might not be the most prolific meteor shower on record and this might not be the perfect peak, but this year's presence is...
  • Annular Eclipse Photos, Videos From Earth and Space سه‌شنبه 29 دی‌ماه سال 1388 14:37
    Caption: Annular solar eclipse on January 15 , 2009. Courtesy Daniel Fischer, " cosmos4u" on Twitter . The first of two solar eclipses to occur in 2010 took place Friday, January 15. This was an annular eclipse , which means the Sun was not totally covered by the Moon , creating a " ring of fire ."...
  • If Phoenix Arises, Science could flow quickly سه‌شنبه 29 دی‌ماه سال 1388 14:36
    Caption: This mosaic assembled from Phoenix images shows the spacecraft's three landing legs and patches of water ice exposed by the landing thrusters. Splotches of Martian material on the landing leg strut at left could be liquid saline-water. Larger version on Spaceflightnow.com .Credit: Kenneth Kremer, Marco Di...
  • Astronomy Without A Telescope – Getting Orientated سه‌شنبه 29 دی‌ماه سال 1388 14:34
    We’ve all been there. You’ve met someone nice – but for some inexplicable reason, they don’t get astronomy. So how do you start gently introducing them to your life’s passion (about astronomy that is) without scaring them away? (...) Read the rest of Astronomy Without A Telescope – Getting Orientated (493 words)
  • NASA Science News for January 15, 2010 سه‌شنبه 29 دی‌ماه سال 1388 14:31
    Last year, when NASA's IBEX ( Interstellar Boundary Explorer ) spacecraft discovered a giant ribbon at the edge of the solar system, researchers were mystified. They called it a "shocking result" and puzzled over its origin. Now the mystery may have been solved. FULL STORY at...
  • NASA Science News for January 14, 2010 سه‌شنبه 29 دی‌ماه سال 1388 14:28
    NASA 's next great observatory, the James Webb Space Telescope , is designed to study stars and galaxies. Astronomers are beginning to realize, however, that Webb will make a great planet hunter too. FULL STORY at http://science.nasa.gov/headlines/y2010/14jan_planetsafari.htm?list1035898
  • Giant Magnetic Loop Stretches Between Two Stars سه‌شنبه 29 دی‌ماه سال 1388 14:28
    Superposed image of a partial radio loop on Algol's inner binary. The optical-radio registration is within 0.3 mas. Credit: University of Iowa Using a collection of radio telescopes , astronomers have found a giant magnetic loop stretched outward from one of the stars making up the famous binary star system Algol,...
  • First Direct Spectrum of an Exoplanet Orbiting a Sun-like Star سه‌شنبه 29 دی‌ماه سال 1388 14:27
    Image of the HR 8799 system. Image credit: MPIA / W. Brandner Astronomers have obtained the first direct spectrum – a “chemical fingerprint” – of a planet orbiting a distant, Sun -like star , providing direct data about the composition of the planet's atmosphere. An international team of researchers studied the...
  • Measuring the Moon's Eccentricity at Home سه‌شنبه 29 دی‌ماه سال 1388 14:22
    Caption: View of the moon at perigee and apogee As a teacher, I'm always on the lookout for labs with simple setups appropriate for students. My current favorite is finding the speed of light with chocolate . In a new paper recently uploaded to arXiv , Kevin Krisciunas from Texas A&M describes a method for...
  • Unprecedented Images Show Betelgeuse Has Sunspots سه‌شنبه 29 دی‌ماه سال 1388 14:20
    Caption:The surface of Betelgeuse in near infrared at 1.64 micron in wavelength, obtained with the IOTA interferometer (Arizona). The image has been re-constructed with two different algorithms, which yield the same details, of 9 milliarcseconds (mas). The star diameter is about 45 milliarcseconds. Credit: Copyright...
  • Dark Energy Model Explains 'Hubble Sequence' of Galaxies سه‌شنبه 29 دی‌ماه سال 1388 14:19
    Caption: A figure illustrating the Hubble sequence . Image: Ville Koistinen One look at a Hubble Deep Field image reveals that galaxies come in all sorts of shapes and sizes. But why? Astronomers have been at a loss to explain the diversity of galaxy shapes seen in the Universe . But now, two astronomers have tracked...
  • Time-Lapse Movie Shows Massive Stars Form Similarly to Smaller S سه‌شنبه 29 دی‌ماه سال 1388 14:17
    It has been difficult for astronomers to see how massive stars form, since these stars are rare, form quickly and tend to be enshrouded in dense, dusty material which obscures them from view. But astronomers using the Very Long Baseline Array (VLBA) radio telescope were able to take images of the wavelengths of light...
  • Vyugovey – The Real "Ice In Space" سه‌شنبه 29 دی‌ماه سال 1388 14:16
    Ain't no doubt about it… Space is cool! And this year Russian space exploration is not only cool – but ice cold. This year’s International Festival of Snow, Ice and Light sculptures “Vyugovey” will take place in Moscow from December 25 to February 28 in the Memorial Museum of Space Exploration {ark on Prospekt Mira,...
  • STS-130 Shuttle flight facing delay due to Payload technical gli سه‌شنبه 29 دی‌ماه سال 1388 14:14
    Caption: Overhead view of Tranquility & Cupola modules inside the Space Station Processing Facility at Kennedy Space Center on Jan 8, 2010. Tranquility will be attached to ISS by STS 130 astronaut crew. Credit: Ken Kremer ( Editor's Note : Ken Kremer is in Florida for Universe Today covering the pre-launch...
  • More Saturn System Beauty from Cassini یکشنبه 20 دی‌ماه سال 1388 01:29
    Caption: Cassini captures Rhea and Saturn 's rings. Credit: NASA/JPL/ Space Science Institute The stunning images just keep coming from Cassini. Here's a collection of three recent images. Above, Saturn's moon Rhea teams up with the planet 's rings, creating an image that could only come from the Saturn system. Taken...
  • Weekend SkyWatcher's Forecast – January 8-10, 2010 یکشنبه 20 دی‌ماه سال 1388 01:28
    Greetings, fellow SkyWatchers! While the skies don't change a whole lot from year to year, how you approach astronomy and what you can do with your "astronomy time" certainly does! We begin the weekend with a variable star and a great galaxy . Ready for more? Then why not tackle an historic learning project...
  • NASA Science News for January 8, 2010 10:00:00 AM یکشنبه 20 دی‌ماه سال 1388 01:27
    Most astronomers wouldn't dream of opening their observatory's doors in 100 mph winds. Yet NASA's new SOFIA telescope recently flew in an airplane at 250 mph with doors wide open. The successful test is an important step forward for infrared astronomy . FULL STORY at...
  • Supernova Simulations Point to White Dwarf Mergers یکشنبه 20 دی‌ماه سال 1388 01:25
    Type Ia supernovae, some of the most violent and luminous explosions in the Universe , have become a handy tool for astronomers to measure the size and expansion of the Universe itself. Because they explode with a rather specific peak luminosity , they can be used as " standard candles " to measure...
  • Another Antimatter Supernova Discovered یکشنبه 20 دی‌ماه سال 1388 01:25
    Here's another extremely explosive supernova that can be chalked up to the production of antimatter in the core of the star : Y-155. These types of supernova explosions – which can be ten times brighter than the already spectacular explosion of a Type Ia supernova – have been theorized to exist for over forty years....
  • Faster-Than-Light Pulsar Phenomena یکشنبه 20 دی‌ماه سال 1388 01:22
    Observational data from nine pulsars , including the Crab pulsar , suggest these rapidly spinning neutron stars emit the electromagnetic equivalent of a sonic boom, and a model created to understand this phenomenon shows that the source of the emissions could be traveling faster than the speed of light . Researchers...
  • Spitzer Peers Into the Small Magellanic Cloud یکشنبه 20 دی‌ماه سال 1388 01:21
    This week at the AAC Conference, astronomers released a new image of the Small Magellanic Cloud (SMC, a dwarf galaxy just outside our Milky Way ) from Spitzer. The purpose of the image was to study "the life cycle of dust in this galaxy ." In this life cycle, clouds of gas and dust collapse to form new stars...