My personal take on what's going on within our Event Horizon. Mostly astronomical, often cosmological, usually quite grumpy.
Fish
Get link
Facebook
X
Pinterest
Email
Other Apps
My kids are interested in making a stop-motion movie, so I grabbed Framebyframe for a whirl, and it seems to work. The boys have made a couple of lego movies, but here's my first attempt;
Everyone loves black holes. Immense gravity, a one-way space-time membrane, the possibility of links to other universes. All lovely stuff. A little trawl of the internets reveals an awful lot of web pages discussing black holes, and discussions about spaghettification, firewalls, lost information, and many other things. Actually, a lot of the stuff out there on the web is nonsense, hand-waving, partly informed guesswork. And one of the questions that gets asked is "What would you see looking out into the universe?" Some (incorrectly) say that you would never cross the event horizon, a significant mis-understanding of the coordinates of relativity. Other (incorrectly) conclude from this that you actually see the entire future history of the universe play out in front of your eyes. What we have to remember, of course, is that relativity is a mathematical theory, and instead of hand waving, we can use mathematics to work out what we will see. And that's what I did. ...
While I read science fiction, I don't read a lot of it. I prefer history books (and while the 6th June was focused on the transit of Venus, it is famous for another big historical event ). I'm not a fan of "magic" science fiction, where the equivalent of a magic wand is waved, with some pseudo-scientific gobbledygook, to fix a problem. So, I am going to talk about a book that doesn't, namely Rendezvous with Rama by Arthur C. Clarke . I'll start with two confessions. Firstly, I don't really like a lot of Clarke's work. And second, I didn't actually read the book; I had it read to me. To explain the latter statement, way-back-when I worked for the Anglo-Australian Observatory . Like virtually all support astronomers (those who show astronomers observing with the telescope the ropes) I lived in Sydney, but one week in five I had to travel to the telescope, a 5-6 hour drive. So I used audio books to maintain my sanity. And one of them was Rende...
Event Horizon was a somewhat dodgy sci-fi-horror movie that came out in the late 1990s. As the title suggests, associated with an Event Horizon is "Infinite Space, Infinite Terror". Luckily, the Event Horizon in the film as a black hole Event Horizon, and I'll leave discussing those to another time. Today, we'll try and understand the Cosmological Event Horizons. To explain these, I am shamelessly going to use the (still) excellent cosmological figures produced by Tamara Davis . OK, let's start with this one. To understand what this picture is telling us, we need to remember a few things. Our universe has three spatial dimensions, and any spatial point can be labelled with three numbers. In a Cartesian coordinate system , these are (x,y,z). As we are dealing with relativity, we are dealing with not only space, but space-time, and every point in the universe is labelled by 4 numbers, the three spatial coordinates and the time, t. So, every point is labelled...
Comments
Post a Comment