My Universe
From my insignificance, I'm looking at the stars
In this mysteriously leaked DVD commentary for Season 4 of “Game Of Thrones,” author George R.R. Martin drops some MASSIVE plot bombshells. You’ve been warned. [x]
Crying omg
(Source: stark-queen, via presstartoplay)
To efficiently travel in the solar system (like, using gravity as much as possible and fighting it as little as possible — cf, Dao/wuwei 無爲) you want to weave among these moving pullers like a Tarzan brachiating among the vines.
via @vruba:
It wasn’t so much learning as relearning, but I was delighted the other day when one Peter R. – no, that won’t do; let’s call him P. Richardson – linked to the interplanetary transport network. This is a fluid set of easy paths around the Solar System that has only a very abstract kind of existence but is of first importance if you want to, say, send something to Mars.
Orbital mechanics are way beyond my understanding, but they’re really cool. Twice now I’ve implemented the velocity Verlet integrator, without really getting why it works, to play. Actually, a friend of my family is a mathematician whose entire – quite successful – career is in geometric integration. He’s published a couple dozen papers on, basically, the plusses and minuses of various ways of simulating simple physical systems. It’s all just super neat. Did you know Buzz Aldrin figured out an important Earth-Mars orbit?
E poi succede che incontri una ragazza, del tuo stesso paese -fottuti 20000 abitanti, per dio- carina, la vedi per la prima volta e rimani incantato, la rivedi dopo una settimana e ti presenti in maniera imbarazzante, c’è feeling ma non le chiedi il fottuto numero… la rivedi dopo due settimane per 10 minuti sempre sui mezzi pieni di gente, costretti a stare come lego e nemmeno là chiedi il numero. brutta situazione, ci può stare. Speri di rivederla la settimana seguente, non succede. Cerchi come un dannato ma non c’è. E scopri per caso che questo venerdì era anche il suo ultimo giorno di università: niente speranze per settembre-si laurea-, zero speranze di vederla in giro per il paesino di merda. E’ sfiga unita a sfigataggine e incapacità di essere incisivi. FUCK!
Titolo? arrivano i 21 e la sfiga rimane
Planck Time
What is the smallest unit of time you can conceive? A second? A millisecond? Hard to say seeing as how time is relative. Under the right circumstances, hours can fly by and seconds can feel like a lifetime. But unfortunately for physicists, time is not something that can be delt with so philosophically. And since they deal with cosmological forces both infinitesimally large and small, they need units that can objectively measure them. When it comes to dealing with the small, Planck Time is the measurement of choice. Named after German physicist Max Planck, the founder of quantum theory, a unit of Planck time is the time it takes for light to travel, in a vacuum, a single unit of Planck length. Taken together, they part of the larger system of natural units known as Planck units.
Originally proposed in 1899 by German physicist Max Planck, Planck units are physical units of measurement defined exclusively in terms of five universal physical constants. These are the Gravitational constant (G), the Reduced Planck constant (h), the speed of light in a vacuum (c), the Coulomb constant(ke or k), and Boltzmann’s constant (kB, sometimes k). Each of these constants can be associated with at least one fundamental physical theory: c with special relativity, G with general relativity and Newtonian gravity, with quantum mechanics, with electrostatics, and kB with statistical mechanics and thermodynamics. They were invented as a means of simplifying the particular algebraic expressions appearing in theoretical physics, especially in quantum mechanics.
Ultimately, Planck time is derived from the field of mathematical physics known as dimensional analysis, which studies units of measurement and physical constants. The Planck time is the unique combination of the gravitational constant G, the relativity constant c, and the quantum constant h, to produce a constant with units of time. They are often semi-humorously referred to by physicists as “God’s units” because eliminate anthropocentric arbitrariness from the system of units, unlike the meter and second, which exist for purely historical reasons and are not derived from nature. Some challenges to Planck’s Time have been mounted. For example, in 2003 during the analysis of the Hubble Space Telescope Deep Field images, some scientists speculated that where there are space-time fluctuations on the Planck scale, images of extremely distant objects should be blurry. The Hubble images, they claimed, were too sharp for this to be the case. Other scientists disagreed with this assumption however, with some saying the fluctuations would be too small to be observable, others saying that the speculated blurring effect that was expected was off by a very large magnitude. A unit of Planck Time can be expressed (in the third picture).
Read more: http://www.universetoday.com/79418/planck-time/#ixzz2U4Nz4Ov1
(via rustedsatellites)
Science and Space Posters by Ron Guyatt
Part of a series for spacevidcast.com to help inspire and spread the Good Word of Science! Prints available at etsy.
(via itsfullofstars)
It’s been a loooooong time since I felt this way. Or maybe I never did. Thursday, please come!
