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عناوین یادداشت‌ها

  • Fermi Spies Energetic Blazar Flare دوشنبه 23 آذر‌ماه سال 1388 11:14
    A comparison of the Fermi images from November 3rd and December 2nd of this year, showing the brightening of 3C 454.3. Image Credit: NASA/DOE/Fermi LAT Collaboration The blazar 3C 454.3, a bright source of gamma rays from a galaxy 7 billion light-years away just got a whole lot brighter. Observations from the Fermi...
  • NASA Science News for December 11, 2009 دوشنبه 23 آذر‌ماه سال 1388 11:13
    This week, researchers attending the United Nations Climate Change Conference in Copenhagen unveiled a unique web site that gathers and organizes climate data for decision makers, professional scientists and lay people. FULL STORY at http://science.nasa.gov/headlines/y2009/11dec_climateonestop.htm?list1035898
  • Wow! Astronauts on EVA, As Seen From Earth دوشنبه 23 آذر‌ماه سال 1388 11:13
    Ralf Vandebergh's detail of an image he took on March 21, 2009 showing astronauts working outside the ISS. Credit: Ralf Vandebergh Remember when it was a big deal when amateur astronomers starting imaging the International Space Station as seen from Earth , showing individual modules and other parts of the space...
  • Half a Million Galaxies, Yours to Explore دوشنبه 23 آذر‌ماه سال 1388 11:12
    Move over, Hubble Deep Field . The Canada-France-Hawaii Telescope has released a new deep-field image of as many as 500,000 galaxies out to a distance of 7 billion light years. And you can surf the entire image at high resolution with an interactive zoom feature at the CFHT website. (...) Read the rest of Half a...
  • Earth's Atmosphere Came from Outer Space دوشنبه 23 آذر‌ماه سال 1388 11:11
    Artist impression of the Late Heavy Bombardment period. Credit: NASA A new study finds the gases which formed the Earth 's atmosphere – as well as its oceans – did not come from inside the Earth but from comets and meteorites hitting Earth during the Late Heavy Bombardment period. A research team tested volcanic gases...
  • Saturn's Hexagon Endures! دوشنبه 23 آذر‌ماه سال 1388 11:08
    This movie from Cassini, made possible only as Saturn 's north pole emerged from winter darkness, shows new details of a jet stream that follows a hexagon-shaped path and has long puzzled scientists. The Cassini spacecraft was able to take another look at one of Saturn's strangest features – a bizarre six-sided cloud...
  • Extra Star Found in the Big Dipper دوشنبه 23 آذر‌ماه سال 1388 11:08
    The handle of the Big Dipper just got stronger! Astronomers have found an additional star located in the Dipper's gripper that is invisible to the unaided eye. Alcor, one of the stars that makes the bend in the Big Dipper's handle has a smaller red dwarf companion orbiting it. Now known as "Alcor B," the...
  • Very First Image of a Very Hot Star دوشنبه 23 آذر‌ماه سال 1388 11:07
    No, this article is not about Johnny Depp or Angelina Jolie . They may be hot stars , but in comparison to the star at the center of the Bug Nebula , pictured left, they've got nothin'. The first image of the star at the center of the Bug Nebula (NGC 6302) has been taken by a team of astronomers at the Jodrell Bank...
  • Hubble Takes a New "Deep Field" Image with Wide Field Camera 3 دوشنبه 23 آذر‌ماه سال 1388 11:06
    Hubble's latest image is another stunner — and just look at all the galaxies ! Hubble has produced a new version of the Ultra Deep Field, this time in near- infrared light and taken with the newly installed Wide Field Camera 3 . This is the deepest image yet of the Universe in near-infrared, and so the faintest and...
  • New Findings Say Mars Methane Comes from Life or Water — or Both دوشنبه 23 آذر‌ماه سال 1388 11:05
    A new paper that will be published Wednesday rules out the possibility that methane is delivered to Mars by meteorites, boosting the idea that the short-lived gas perhaps could be generated by either life or water, or maybe even both. Microorganisms living in the Martian soil could be producing methane gas as a...
  • Exoplanet Not Really There? دوشنبه 23 آذر‌ماه سال 1388 11:05
    This artist's concept shows the smallest star known to host a planet . Image credit: NASA/JPL-Caltech In May 2009, astronomers were jubilant: finally, an extra solar planet had been found by using the method of astrometry. That's great, except, they may not have found a planet after all. Researchers from JPL reported...
  • MRO Comes Out of دوشنبه 23 آذر‌ماه سال 1388 11:04
    Safe Mode Artist impression of MRO. Image credit: NASA/JPL The latest word on the Mars Reconnaissance Orbiter is that the spacecraft has successfully come out of safe mode . The various instruments, including the HiRISE camera are still "safed" at this point, and engineers are waiting for acquisition of...
  • Subject: The 2009 Geminid Meteor Shower دوشنبه 23 آذر‌ماه سال 1388 11:03
    NASA Science News for December 8, 2009 The annual Geminid meteor shower has been intensifying, and researchers say 2009 could be the best year yet. This year's display peaks on Dec. 13th and 14th. FULL STORY at http://science.nasa.gov/headlines/y2009/08dec_geminids.htm?list1035898
  • Red Giant Brightness Variations Still Mysterious سه‌شنبه 17 آذر‌ماه سال 1388 19:42
    Like everything else in the Universe , stars get old. As they become older, stars like our own Sun "puff up", becoming red giants for a period before finally settling down into white dwarfs . During this late period of their stellar lives, about 30% of low-mass red giants exhibit a curious variability in...
  • First Look at SpaceShipTwo سه‌شنبه 17 آذر‌ماه سال 1388 19:41
    Virgin Galactic will unveil SpaceShipTwo (SS2), Monday night, but they did sneak out a few photos prior to the event. SS2 will be the world's first commercial manned spaceship, with room for several passengers to move (and fly!) around during suborbital flights. "This is truly a momentous day. The team has...
  • Dating a Cluster – A New Trick سه‌شنبه 17 آذر‌ماه سال 1388 19:40
    Finding the ages of things in astronomy is hard. While it is undoubted that the properties of objects change as they age, the difficulty lies in that the initial parameters are often so varied that, for most cases, finding reliable ages is challenging. There's some tricks to do it though. One of the best ones, taught...
  • For Christmas – Don't Think Nintendo Wii… Think Celestron Omni سه‌شنبه 17 آذر‌ماه سال 1388 19:37
    Are you looking for the perfect family Christmas gift? Well, stop right there on drawing out your credit card, because there is no such thing. Every family is different. Different needs, different circumstances… even different financial situations. But, what I'm here to tell you about is something I've found that...
  • How Galaxies Lose Their Gas سه‌شنبه 17 آذر‌ماه سال 1388 19:36
    As galaxies evolve, many lose their gas. But how they do this is a point of contention. One possibility is that it is used to form stars when the galaxies undergo intense periods of star formation known as starburst. Another is that when large galaxies collide, the stars pass through one another but the gas gets left...
  • 365 Days of Astronomy to Continue in 2010 سه‌شنبه 17 آذر‌ماه سال 1388 19:35
    Calling all podcasters! The award-winning 365 Days of Astronomy Podcast is proud to announce the project will continue for another 365 days, and is now accepting sign-ups for participants for 2010. Whether you're a seasoned podcaster or if you have never picked up a microphone before, anyone with a love of space...
  • See the Invisible Sky with Chromoscope سه‌شنبه 17 آذر‌ماه سال 1388 19:33
    Screenshot of the new Chromoscope online tool. Unless you're Superman or a rattlesnake and can see in X-ray or infrared , there are aspects of night sky you are missing out on. These days, the wonderful assortment of telescope and spacecraft data at our disposal allow us to "see" our universe in the...
  • Cool – Literally – Extrasolar Planet Imaged سه‌شنبه 17 آذر‌ماه سال 1388 19:32
    Yet another planet outside of our Solar System has been directly imaged, bumping the list up past ten. Given that the first visible light image of an extrasolar planet was taken a little more than a year ago, the list is growing pretty fast. The newest one, planet GJ 758 B is also the coolest directly imaged planet,...
  • Exploring to the Beat of Pulsars سه‌شنبه 17 آذر‌ماه سال 1388 19:30
    Rob Hollow works with students in the PULSE@Parkes project. Credit: Andrew Crosling An innovative project that provides high school students in Australia the opportunity to work with the famous Parkes radio telescope will soon make the data available to schools around the world. The PULSE@Parkes project allows for...
  • Get the Big Picture of the Milky Way at the Adler Planetarium سه‌شنبه 17 آذر‌ماه سال 1388 19:30
    Astronomy is all about getting the big picture of our place in the cosmos, but some pictures are bigger than others. This one is really big. The world's largest image of our Milky Way galaxy went on display today at the Adler Planetarium in Chicago. The image spans an area of 37 meters (120 feet) long by 1 meter (3...
  • Superbright Supernova First Observed of Antimatter Variety سه‌شنبه 17 آذر‌ماه سال 1388 19:29
    The supernova 2007bi, circled in the image above, might be the first confirmation of a pair-instability supernova. Image Credit: Nearby Supernova Factory The supernova 2007bi wasn't your typical supernova: it was 10 times brighter than a Type Ia supernova , making it one of the most energetic supernova events ever...
  • NASA Science News for December 2, 2009 سه‌شنبه 17 آذر‌ماه سال 1388 19:28
    While stuck in a sandtrap, Mars rover Spirit has made a discovery one researcher calls "supremely interesting." FULL STORY at http://science.nasa.gov/headlines/y2009/02dec_troy.htm?list1035898
  • ISS Temporarily Down to Crew of 2 سه‌شنبه 17 آذر‌ماه سال 1388 19:26
    Following today’s departure of the three man crew of Expedition 21 aboard the Soyuz TMA 15 capsule, staffing on the International Space Station (ISS) is now temporarily reduced to a skeleton crew of just 2 men for the first time since July 2006. The ISS had hosted a complete 6 person and truly international crew...
  • Capture A FUor! سه‌شنبه 17 آذر‌ماه سال 1388 19:26
    What accretes quietly in the night and can be a blast to observe? Try a FUor… These high accretion, high luminosity phase pre-main sequence stars may only last a few decades – but display an extreme change in magnitude and spectral type in a very short period of time. While FU Orionis may be the prototype you know...
  • Quasar Caught Building Future Home Galaxy سه‌شنبه 17 آذر‌ماه سال 1388 19:24
    The birth of galaxies is quite a complicated affair, and little is known about whether the supermassive black holes at the center of most galaxies formed first, or if the matter in the galaxy accreted first, and formed the black hole later. Observations of the quasar HE0450-2958 , which is situated outside of a...
  • Hubble Sees Dazzling Dust in the Iris Nebula سه‌شنبه 17 آذر‌ماه سال 1388 19:23
    NGC 7023. Credit: NASA and ESA Another gorgeous image from Hubble! This close-up of NGC 7023, or the Iris Nebula , shows an area filled with cosmic dust . Illuminated from above by the nearby star HD 200775, the dust resembles pink cotton candy, accentuated with diamond-like stars . The "cotton candy" is...
  • Countdown to Christmas: Hubble Advent Calendar سه‌شنبه 17 آذر‌ماه سال 1388 19:15
    This is way cooler than those chocolate filled advent calendars that you can buy at the grocery store (although arguably less yummy): The Big Picture over at The Boston Globe is doing an advent calendar to count down the days until Christmas, only instead of opening a little door to nuggets of chocolate each day, you...