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Or lack thereof.
I’ve been getting lots of questions about my post on how conservation of energy isn’t conserved in an expanding universe. Happily, I just ran across this excellent post from Sean that may clarify things a bit more.
Does Einstein’s general relativity really say that energy is not conserved? You will be unsurprised to […]
The Dark Energy Survey
Man it’s cold outside. Ordinarily, I would be referring to Colorado, where the past few days have seen five inches of snow and about 20 degrees.
This time, I’m actually referring to the weather in another state: Illinois, where it’s cold, rainy and wet. As I look out of my […]
The guys from HubbleSite.org have put together this amazing multimedia presentation on dark energy. Go check it out!
It’s very well presented and geared toward regular folks. It’s clear a lot of effort went into it. Here’s a screenshot (click on it to see a bigger one):
Screenshot from HubbleSite.org
Oooh, I’m getting all warm […]
…I would still eat it.
I supoose I’ll let this article speak for itself:
It would mean our understanding of how the cosmos was born 14 billion years ago is seriously flawed. Astronomers would have redder faces than they’ve had since the beginning of the 20th century, when some scientists claimed they saw “canals” built by Martians […]
It blows my mind sometimes to listen to a cosmologist talk. They make some pretty remarkable statements about the universe, and they do it with such certainty.
For example, we know how big the universe is, we know how many stars are in the universe, likewise the number of galaxies, we know what it’s made […]
One of the things you hear a lot in cosmology, particularly when discussing the amount of dark energy there must be, is that the geometry of the universe tells us a lot about what’s in it.
For example, in order to have a flat, accelerating universe, 70 percent of our universe must contain something like dark […]
I know, I know, I can hear you all harumphing and spluttering all the way over here.
HarumphHarumph What you do mean, man!? Have you gone mad? Harumph, I say to you!
The fact is, there’s nothing in Newton’s physics that requires that energy be conserved. The idea that energy is neither created nor […]
As I write this, I’m watching the Illinois/Ohio State game. Currently, the game is tied 14/14 and I am quite pleased. I mention this not because you may be a football fan but as a hint to where my new job is. One of these schools will be my new professional home.
Now, […]
In a paper that came out earlier in the August Journal of Cosmology and Astroparticle Physics, a group has suggested a really interesting source of dark energy.
For those who don’t know, most of our universe is made up of stuff that won’t have anything to do with us. Only 5% of the universe is […]
Image Credit: Good Ol’ Wikipedia
(I thought about titling this post, “The Expanding Universe Diet”, just to get readers attention, but I refrained.)
By now, you’ve learned that the universe is expanding, and that it’s doing so at the rate given by the Hubble parameter.
OK, so no big deal, the universe is expanding, blah, blah, blah, […]
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