Louisiana Governor Bobby Jindal has signed the Louisiana Science Education Act into law, singling out evolution, origins of life, and global warming for criticism. Let 1,000 Dover trials bloom!
Posts Tagged ‘Science’
Homer’s Odyssey Said to Document 3,200-Year-Old Eclipse [News]
23
Jun
Researchers say that references to planets and constellations in the Odyssey describe a solar eclipse that occurred in 1178 B.C., nearly three centuries before Homer is believed to have written the story. If correct, the finding would suggest that the ancient poet had a surprisingly detailed knowledge of astronomy.
The Odyssey, commonly dated to near 800 B.C., describes the 10-year voyage of the Greek general Odysseus to his home on the island of Ithaca after the fall of Troy in approximately 1200 B.C. Toward the end of the story, a seer named Theoclymenus prophecies the death of a group of suitors competing for the affection of Penelope, the wife of Odysseus, who is believed to be dead. Theoclymenus delivers his prophecy as the suitors are sitting down for their noontime meal. He foresees them entering Hades and ends his speech with the statement, “The Sun has been obliterated from the sky, and an unlucky darkness invades the world.” Odysseus dispatches the suitors not long thereafter.
Science Question: If the universe is expanding at an accelerating pace – is gravity’s effect on time the culprit?
31
Jan
I have been watching the debate about dark energy as a possible explanation of what is causing the universe to expand faster and faster (as cosmologists first discovered 10 years ago). But last night, as I was watching the new series “The Universe”, I was reminded of a particularly interesting facet of Einstein’s relativity theory – the effect of gravity on time. Bottom line of that theory is that time passes slower when you are inside a gravitational field.
This is something NASA has been able to demonstrate by putting atomic clocks in orbit and that the programmers of the GPS satellite system had to take into account to make the system work properly. Clocks (and all other matter) move faster when there is less gravity. Time, as we measure and understand it, passes slower on earth, than in orbit, and it is faster still once you get away from the sun, and even faster when you get out of the Milky Way. This leaves me with 2 questions:
1) If time is passing faster, the further away from a gravitation field you get, wouldn’t that explain why the universe is expanding faster? Eventually, as galaxies get further apart, there is less and less gravity in inner-galactic space, thus (I would assume) time is going faster between galaxies and the “normal” expansion process would be occurring at an accelerated pace. In other words, voids grow faster than matter rich areas of the universe because everything happens faster there. Think of a large balloon that is expanding on a wall of video monitors, some of the videos are playing faster and thus that part is expanding more rapidly. Not only that, be the expansion itself is causing gravity to be less and less on an influence because the galaxies are now further away (more space-time between them). Will time eventually become a run-away engine in the vast emptiness of space? Will the speed of time approach infinity?
Fact: The emptier space is (the less gravity) – the faster time passes.
One way I thought to test this would be to observe the speed of stars (if there are any) or any other matter in the “vast hole in the universe” that was discovered recently. If “emptiness” has the affect of accelerating time, that may be measurable by observing its affect on light traveling through those empty spaces. (objects opposite fast empty holes in the universe would appear closer than they really are)
2) About this time/gravity relationship. I imagine that as gravity approaches infinity as in a black-hole, time approaches zero. If time is slowed down – then what does that say about the spectacular speeds of stars orbiting black-holes? Have those calculations beed adjusted for this? Is there even a mathematical way to express time passing differently in different regions of the universe?
As I type this, it also occurs to me that this may also explain why there seem to be few stars between galaxies – maybe they age and die very quickly. I don’t understand the math well enough to try and calculate the relative difference in the rate of time in inner-galactic space versus on earth – much less in the middle of that billion-light year wide void, but imagine if there is a measurable between the surface of the earth, and 200 miles up in orbit, that a billion-light years of gravity free space might tack on the years pretty quickly.
If any one out there has a science background I would love to hear from you in the comments.
Google Adsense Account Disabled
29
Jan
See Update: Sweet sweet justice. Praise be to Google.
I’m a big fan of Google (always have been) but I’m staring to worry that maybe I’ve given them a little to much trust and power. I have been a beta tester on almost all of their programs. I’ve played with everything in the Google lab, and been an advocate of all their services. But today I was sent a message telling me that my adsense account was disabled. I understand they have to protect the integrity of the system, but after looking into it, I can not figure out what they think I have done wrong. This is what they wrote:
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Decode Your Genome For $1,000
07
Dec
For $1,000, a small California-based company called 23andMe (financed in part by Google) will decode your DNA and tell you whatever it can about your predispositions, health risks, and family traits—for example, whether or not you’re in line for the same heart disease that affected your father and grandfather, which is what the author of the Wired article wondered. (Turns out he’s not, but he’s at a higher risk of developing glaucoma. When one door opens…)
For now, companies are offering genotyping—”the strategic scanning
of your DNA for several hundred thousand of the telltale variations
that make one human different from the next.” It will take a few more
years before anyone can offer (or afford) to sequence all 6 billion
points of a person’s genetic code, but in the meantime, genotyping can
provide a lot of the kind of health-related information many people
would love to know.
