19 Matching Annotations
  1. Aug 2020
    1. Perfect Astronomy App For Stargazing

      The Sky Safari app is really easy to use, just hold your mobile device towards the sky, and the app will quickly locate planets, constellations, satellites, and millions of stars.

    1. Cells, for example, are a central category, but there’s no definite criterion for what counts as a cell. If you attempt to find one, you rapidly bog down in a maze of exceptions. You might start with something like “a self-reproducing living unit carrying a single copy of the organism’s DNA within a membrane.” But red blood cells don’t self-reproduce and have no DNA. Mitochondria are not cells, but they self-reproduce using their own DNA within a membrane. Muscle cells have multiple nuclei, each with a separate complete copy of the DNA. Some algae have life stages in which they have no cell membranes. And so on indefinitely.8

      I'm not an expert in biology or anything, but perhaps the moral there is we should rethink this 'cell' idea? IIRC astronomers continue to talk about 'planets' even though the longer you examine the concept the more incoherent it becomes. (For an extended example, see the infamous Discourse about whether "Pluto is a planet", which led to hilarious goal post stretching where people kept trying to find a definition of 'planet' that exactly fit the traditional celestial objects we classify as planets without having to include any new ones or exclude existing ones)

      There is obviously no rule that says the categorizations we come up with for stuff when a field is young should be expected to have infinite inferential reach as that field of knowledge expands.

  2. Mar 2020
    1. If you’re planning on flying a robotic or even human mission in the near future to the Moon, an asteroid or even Mars, one indispensable requirement you’ll face is the need for at least one deep-space tracking dish to communicate with your craft.
  3. Nov 2019
    1. Which Planet is the Closest?

      Thanks to its shortest orbit time, Mercury is the "mostest" closest planet to all the planets that orbits the sun

  4. May 2019
    1. Well, it’s exactly the approach that I took. I approached this with a scientific mind, like I approach any other problem in astronomy or science that I work on. The point is that we follow the evidence, and the evidence in this particular case is that there are six peculiar facts. And one of these facts is that it deviated from an orbit shaped by gravity while not showing any of the telltale signs of cometary outgassing activity. So we don’t see the gas around it, we don’t see the cometary tail. It has an extreme shape that we have never seen before in either asteroids or comets. We know that we couldn’t detect any heat from it and that it’s much more shiny, by a factor of ten, than a typical asteroid or comet. All of these are facts. I am following the facts.
  5. Oct 2018
  6. Jun 2018
  7. Mar 2018
    1. SOLLUX CAPTOR

      yall know the drill by now

      Sollux rather transparently divides into "sol-lux", the Latin words for "sun" and "light", respectively. As such, his name would literally mean 'Sunlight Catcher'.

      If one would switch the S and P in his name it becomes "Pollux Castor." Pollux and Castor are the two brightest stars in the constellation of Gemini. It is also worth noting that Pollux is a red giant, while Castor is bluish white, complementing the red/blue duality theme. Castor and Pollux were famous mythological twins, which is where Gemini - Latin for "twins" - gets its name. Pollux and Castor were also the names of two characters in the movie Face/Off, a Nicolas Cage flick that came out the same year as Con Air and one that John Egbert has a poster of in his room.

      http://mspaintadventures.wikia.com/wiki/Sollux_Captor

  8. Dec 2017
    1. Of another parcel of 153 acres near the former, and including a considerable eminence very favorable for the erection of a future observatory.

      This excerpt is very interesting as the reservation of land for the specific purpose of constructing an observatory seems to be very peculiar when considering the primary plans for the University. However, its inclusion is very relevant, as such reservations lead to the construction of the Leander McCormick Observatory, which currently sits on the summit of Mount Jefferson, commonly referred to as Observatory Hill. Though it took nearly 70 years for such plans to be carried out, the implementation of the McCormick Observatory has proved to be a prominent addition to the University, as it has helped enhance the education and has also served as a platform for astronomical research within the Astronomy Department.

      Link: http://astronomy.as.virginia.edu/research/observatories/mccormick

  9. Oct 2017
    1. You have probably heard about the hunt for dark matter, a mysterious substance thought to permeate the universe, the effects of which we can see through its gravitational pull. But our models of the universe also say there should be about twice as much ordinary matter out there, compared with what we have observed so far.

      Two separate teams found the missing matter – made of particles called baryons rather than dark matter – linking galaxies together through filaments of hot, diffuse gas.

  10. Feb 2016
    1. An all-star international team of astrophysicists used an exquisitely sensitive, $1.1 billion set of twin instruments known as the Laser Interferometer Gravitational-wave Observatory, or LIGO, to detect a gravitational wave generated by the collision of two black holes 1.3 billion light-years from Earth.
  11. Jan 2016
  12. Nov 2014
    1. manuscript

      Does the term "manuscript" still work for born digital and fully digital documents? Remember, there are no print editions of AAS journals as of 2015!

    2. I'm doing a collaborative annotation of this page to see if a) people want to give feedback on the utility of these instructions and b) to see if anyone wants to collaboratively annotate a document.

    3. Online-only Figures Online-only figures are intended to provide supplementary information that is not critical to the scientific content of the paper but that provides additional useful information for the reader. They are not allowed when the figures are an integral part of the paper, or simply to limit page charges. Such materials will carry a nominal publication charge depending on the number and size of the figure files, but again this will be a small fraction of the cost of printing the same volume of material. Note that online-only materials are subject to the same peer-review standards as the rest of the manuscript, and their inclusion should be justified on scientific grounds.

      This entire section has to be re-written because

      1. everything is an "online-only"figure.
      2. there is no printing.
      3. we now use "quanta" not "page charges"
    4. In the printed paper, the placement of tables will be determined by their first mention in the text.

      There is no printed version...