Bike Messengers Fight to Take Back Europe’s Most Congested City
Brussels Express, a documentary by Sander Vandenbroucke, looks at how commuters and messengers can make a dent in the city’s overwhelming traffic.
The Fabric of Space-time
Image: What happens to light as it passes through a point of space-time in where mass has been applied, as well as why objects in space orbit the way they do (planets, galaxies, clusters, etc.)
Also known as the Space-time Continuum, I’ve always been fascinated about the very space that holds the planet we live on, stars we see at night, solar system we observe, and supernovas we stargaze on telescopes. In astronomy you hear the term space-time get used a lot and I thought I’d highlight key features that describe what this fabric is. I find it odd that not that many people stop to think what holds us up, how are we suspended in space-time? Well, technically we’re not suspended. We’re constantly moving, constantly orbiting. And it’s not just Earth and the solar system joining in on this cosmic dance, you can include star clusters, galaxies, super clusters and even Blackholes, just about everything in our Universe. Keep in mind that even as you read this post, our solar system is orbiting the Milky Way galaxy, traveling at roughly 220 kilometers a second!
What is Space-time?
Einstein visualized gravity as a manifestation of the curvature of space-time - the three space dimensions and a fourth time dimension. Most of us cannot visualize a curvature of four dimensional space-time, so visualize a curved two dimensional rubber sheet. Placing a mass on the rubber sheet curves it downward like space-time curves in the presence of a mass. On such a rubber sheet a small mass can circle around the curvature produced by a large mass, just as planets orbit the Sun. Or a mass can roll straight downward just as an object falls to the Earth. Space-time being the very “material” these events and masses take place on.
Einstein explained gravity as a result of the curvature of space-time near the presence of a mass. The differences between general relativity and Newton’s law of gravity only become noticeable when the gravitational force is very strong.
Einstein’s general theory of relativity is one of the crowning intellectual achievements of the 20th century and led to such predictions as black holes, gravitational lenses, and the expanding universe. So far it has passed every experimental test with flying colors.
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Are you near Portland, Oregon and need something to do this weekend?
Even if you have something planned, cancel it and go and say hello to Eric at Spin Cycle Industries. He’s got a bike show going on and there is…wait for it, w a i t f o r i t…..
FREE BEER
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1 week ago - 13
13Cognito.Meo: from a Liverpool FC fan...
The last two years in the English Premier League have been hard if you were a Liverpool FC fan. I’m writing this after reading all the Kit controversy, Warrior vs Adidas bla bla bla. But this seems to be the latest problem for the great team. I’ve been a fan since 2001, saw a game on the television and the style of football - so smart and quick and controlled - and in the RED!
But it seems sad now, that Rafa Benitez stepped down / got fired just because the team did not make the Champions League Qualification. When they had before under him, and also won it under him. Sad. Then the under whelming performance under Roy, though the wins over Chelsea were awesome - but now it is believed that Torres was just performing for his soon to be owner. Sad. We loved you Torres, we loved you. It was GREAT to see Liverpool beat Chelsea. on their Pitch. on Torres’s Debut. with the old Liverpool Team without the New Players. A Fantastic day. Yes we all loved King Kenny that Day. I was so happy with LFC at the end of the season. To climb from the teens to the top 6 in half a season. But then the next season - several new players, letting go of the KOP’s Voted MVP Raul Meireles to Chelsea, the ramshackle team that was left after Stevie G and Jamie Carra’s injuries-Torres departure-Carroll’s under performance- That Team that brought Liverpool back up the table, That Team was not the team to start majority of the games in this last season. The new players were slotting in, taking up the space and benching Kuyt, Maxi, Aurelio, Johnson, Kelly, Carragher. Then the stubbornness of the team with the handling of the Racism controversy.
We have not been a top four team since Rafa. Remember when commentators use to talk about the “Liverpool Defense” during the season and Champions League Season. After the move Meireles said He did not want to leave - he wanted to stay on the non champions league team rather than his new Champions league contending team. Probably wouldn’t say it now, but oh well. Here and now - looking back, the failure that could be said about Rafa when he left the team - is a result that is better than the current condition and position of the team. Blindly Agreeing with the Team is not the only form of support & love for the team - Showing & pointing one’s Concern for something they love is Showing them they Never Walk Alone.
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