October 2011
56 posts
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Here are a few beauts to share with you guys today from Universe Today: IC 1396 by John R. Taylor Milky Way by Brent Hall Tiangong 1 by Tavi Greiner ——-Sharing via these buttons will share…
Earlier generations have weathered recessions, of course; this stall we’re in has the look of something nastier. Social Security and Medicare are going to be diminished, at best. Hours worked are up even as hiring staggers along: Blood from a stone looks to be the normal order of things “going…
We think of a physical object’s being a certain “color” as a solid, immutable property (grass is green, lemons are yellow, et cetera). However, the way our brains see and process color is largely determined by the language we learned as an infant.
Case in point: the Himba tribe of remote…
This is massive and wonderful and, yes, I do get a little thrill from seeing something I worked on there on the list.
Sad that you’re all out of Who until the Christmas special? Have at it, m’dears and see that you’re good for the next couple of years.
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In 1998, the Hubble Space Telescope was pointed at HR 8799, in hopes of seeing any potential planets that might be orbiting that nearby, Sun-like star. None were found… but in 2008 images using the Gemini telescope found several planets orbiting HR 8799. In fact, four planets were discovered there!
What costs a billion euros, can operate in temperatures in excess of 500 degrees celsius, and orbits the sun closer than any spacecraft in human history?
This made my brain hurt a bit, but it’s worth a read if you’re interested in what all this dark energy talk is about.
(via Cosmic Variance on Discovery)
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In honor of the Nobel Prize, here are some questions that are frequently asked about dark energy, or should be.
What is dark energy?
It’s what makes the universe accelerate, if indeed there is a “thing” that does that. (See below.)
So I guess I should be asking… what does it mean to say the universe is “accelerating”?
First, the universe is expanding: as shown by Hubble, distant galaxies are moving away from us with velocities that are roughly proportional to their distance. “Acceleration” means that if you measure the velocity of one such galaxy, and come back a billion years later and measure it again, the recession velocity will be larger. Galaxies are moving away from us at an accelerating rate.
But that’s so down-to-Earth and concrete. Isn’t there a more abstract and scientific-sounding way of putting it?
