Skip to main content

Home/ Long Game/ Group items tagged astronomy

Rss Feed Group items tagged

anonymous

Phil Plait's Bad Astronomy: --SPOILERS!-- Review: Armageddon - 0 views

  •  
    "Here's the short version: "Armageddon" got some astronomy right. For example, there is an asteroid in the movie, and asteroids do indeed exist. And then there was... um... well, you know... um. Okay, so that was about all they got right. Now I know that accuracy was not the main point of the movie, and clearly from the way the plot played out, realism was the last thing on the minds of the writers. One person who emailed me said the movie had "sub-comic book level science" which is pretty much right. But as always, I can use their Bad Astronomy as a jumping off point for some Good Astronomy. Shall we start?"
anonymous

New study clinches it: the Earth is warming up | Bad Astronomy | Discover Magazine - 0 views

  • The 2009 State of the Climate report released today draws on data for 10 key climate indicators that all point to the same finding: the scientific evidence that our world is warming is unmistakable. More than 300 scientists from 160 research groups in 48 countries contributed to the report, which confirms that the past decade was the warmest on record and that the Earth has been growing warmer over the last 50 years.
  • That’s not correct. Of course this report is deniable. That’s what deniers do: deny. And we’ll be hearing from them in the comments below, have no doubts.
  • Mind you, I am distinguishing, as I always do, between deniers and skeptics. Those are two very different things. I am, quite literally, a skeptic of global warming. I do think it’s happening, but that’s because that’s what the evidence is telling me.
  • ...2 more annotations...
  • If good, solid evidence came along that contradicted that, I would a) look at it, and b) assess it, and c) if it’s incontrovertible then I would change my mind.
  • But to deny means to ignore the evidence, or twist it, spin it, cherry-pick it, distort it.
  •  
    "For quite some time now, the evidence that the Earth is warming up has been piling up. Study after study has shown this, and that's why the vast majority of scientists agree on it. And now, to pile on even more, a large NOAA study has been released." By Phil Plait at Bad Astronomy (Discover Magazine) on August 3, 2010.
anonymous

40 years later, failure is still not an option - 0 views

  • This week marks three related anniversaries. April 12, 1961: Yuri Gagarin becomes the first man in space. That was 49 years ago today. April 14, 1970: An oxygen tank disrupts on Apollo 13, causing a series of catastrophic malfunctions that nearly leads to the deaths of the three astronauts. That was 40 years ago this week. April 12, 1981: The first Space Shuttle, Columbia, launches into space. That was 29 years ago today.
  • In 1970 Apollo 13 became our nation’s "successful failure".
  • But I’m old enough to remember when NASA could do the impossible. That was practically their motto. Beating the Soviets was impossible. Landing on the Moon was impossible. Getting Apollo 13 back safely was impossible.
  • ...4 more annotations...
  • Don’t get me wrong; the Shuttle is a magnificent machine. But it’s also a symbol of a political disaster for NASA.
  • Now, there’s a lot to be said for low Earth orbit. It is a fantastic resource for science, and I strongly think we should be exploiting it even more.
  • The idea of going back to the Moon is one I very much strongly support, but I get the impression that the plan itself is not well-thought out by NASA. The engineering, sure, but not the political side of it. And it’s the politics that will always and forever be NASA’s burden.
  • NASA needs a clear vision, and it needs one that is sturdy enough to resist the changing gusts of political winds.
  •  
    From Bad Astronomy at Discover Magazine. By Phil Plait on April 12.
anonymous

A thousand trillion suns - 0 views

  •  
    By Phil Plait in Bad Astronomy (Discover) on May 5, 2010.
anonymous

New cosmic background radiation map challenges some foundations of cosmology | KurzweilAI - 0 views

  • The fluctuations in the CMB temperatures at large angular scales do not match those predicted by the standard model in physics — their signals are not as strong as expected from the smaller scale structure revealed by Planck.
  • An asymmetry in the average temperatures on opposite hemispheres of the sky runs counter to the prediction made by the standard model that the Universe should be broadly similar in any direction we look.
  • A cold spot extends over a patch of sky that is much larger than expected.
  • ...10 more annotations...
  • Dark energy, a mysterious force thought to be responsible for accelerating the expansion of the Universe, accounts for less than previously thought.
  • One way to explain the anomalies is to propose that the Universe is in fact not the same in all directions on a larger scale than we can observe.
  • In this scenario, the light rays from the CMB may have taken a more complicated route through the Universe than previously understood, resulting in some of the unusual patterns observed today.
  • The Planck data also set a new value for the rate at which the Universe is expanding today, known as the Hubble constant. At 67.15 kilometers per second per megaparsec, this is significantly less than the current standard value in astronomy. The data imply that the age of the Universe is 13.82 billion years.
    • anonymous
       
      Whoa. 13.82 billion?
  • oldest light in our Universe, imprinted on the sky when it was just 380 000 years old.
  • At that time, the young Universe was filled with a hot dense soup of interacting protons, electrons and photons at about 2700ºC.
  • This cosmic microwave background (CMB) — shows tiny temperature fluctuations that correspond to regions of slightly different densities at very early times, representing the seeds of all future structure: the stars and galaxies of today.
  • According to the standard model of cosmology, the fluctuations arose immediately after the Big Bang and were stretched to cosmologically large scales during a brief period of accelerated expansion known as inflation.
  • The asymmetry and the cold spot had already been hinted at with Planck’s predecessor, NASA’s WMAP mission, but were largely ignored because of lingering doubts about their cosmic origin.
  • “The fact that Planck has made such a significant detection of these anomalies erases any doubts about their reality; it can no longer be said that they are artefacts of the measurements. They are real and we have to look for a credible explanation,” says Paolo Natoli of the University of Ferrara, Italy.
  •  
    "The most detailed map ever created of the cosmic microwave background - the relic radiation from the Big Bang - acquired by ESA's Planck space telescope, has been released, revealing features that challenge the foundations of our current understanding of the Universe and may require new physics."
anonymous

Anti-Intellectualism in Boy Scout Badges - 1 views

  • In other words, because women do well in school, it’s no longer manly to do so.   So masculinity becomes increasingly associated with anti-intellectualism, thus the “intellectual passivity” Denny describes.
  • And don’t make a mistake: anti-intellectualism is clearly a non-progressive ideal. Looking up the answer in the back of the book means “trust authority, listen to what your superiors say, don’t bother to look into it for yourself, just believe what we tell you.” It comes directly from the tradition that values, above all, children shutting up and being obedient to adults. Being told to research it yourself says “make up your own mind, learning things is your responsibility, don’t take anyone’s word for it, if your mother says she loves you check it out.” And it comes from the newer idea that children should try to become their own people.
  • The thing is: feminism made Girl Scouts question all the gendered bullshit. Instead of merit badges that told girls how to have a dinner party, feminism made it so that girls had merit badges that taught them about geology or astronomy, because dammit girls should be allowed to know things about space and rocks and not just proper table settings.
  •  
    Sociological Images has an interesting post on the gender differences between Boy Scot and Girl Scout manuals, one bit of which really sticks out to me.
anonymous

Ancient galaxy cluster contains 'modern' galaxies - 0 views

  •  
    On May 13, 2010 in LabSpaces.
anonymous

Newly-discovered galactic arm means the Milky Way is more warped than we thought - 0 views

  • Here's our current understanding of the Milky Way's geography. The central bar has a huge proportion of our galaxy's stars, and jutting off of it are the two main arms of the spiral, which are the Perseus Arm and the Scutum-Centaurus Arm. The other four arms are mostly just gas and relatively unimportant. Our solar system is close to the Perseus Arm, which extends about 300 degrees around galactic center.
  • The discovery of this new arm provides good evidence that the Scutum-Centaurus Arm is just as large and expansive as the Perseus Arm, suggesting we live in an almost perfectly symmetrical galaxy.
  •  
    "It was back in 1852 that College of New Jersey astronomer Stephen Alexander first suggested the galaxy has a spiral shape. Since then, we've identified at least six arms of that spiral, and in the 1990s we found evidence that there is a star-heavy central bar running through the galactic plane. It's not easy figuring all this out because our neighboring stars tend to obscure the ones further away, making it difficult to identify our galaxy's larger structures with precision."
anonymous

Leap Seconds May Hit a Speed Bump - 1 views

  • In order to keep the time determined by Earth's motion in line with the seconds measured by atomic clocks, the International Earth Rotation and Reference Systems Service inserts "leap seconds" into the calendar. But leap seconds may fall out of favor after next year's World Radiocommunication Conference
  • the National Institute of Standards and Technology (NIST) uses the resonant frequency of cesium-133 atoms in the NIST-F1 Cesium Fountain Atomic Clock to keep time so accurately that even if it ran for 60 million years, NIST-F1 wouldn't drop or add a single second.
  • atomic clocks are actually more stable than Earth's orbit—to keep clocks here synched up with the motion of celestial bodies, timekeepers have to add leap seconds.
  • ...2 more annotations...
  • Getting rid of leap seconds would certainly make it easier to calculate UTC, but this measure would also decouple astronomical time from civil time: The time measured by atomic clocks would gradually diverge from the time counted out by the movement of Earth through space.
  • After hundreds of years of letting planetary and lunar motion define time, we will shrink our scale, and let atoms determine it instead.
  •  
    "For most of human history, we have defined time through the movements of planets and stars. One day is the time it takes the Earth to rotate about its axis, one year the duration of a single orbit about the sun. But in January 2012, the way we think of time may change."
anonymous

Scientists are from Mars, the public is from Earth | Bad Astronomy | Discover Magazine - 1 views

  •  
    The American Geophysical Union blog has a link up to a very interesting table, and I feel strongly enough about this topic that I want to share it with you. It's a list of words scientists use when writing or otherwise communicating science, what the scientists mean when they use that word, and most importantly what the public hears.
1 - 10 of 10
Showing 20 items per page