Is Time Travel POSSIBLE?
Saturday, December 16, 2006
Ever wonder of travelling through time? Could it be possible in reality?
I believe you definitely had watched "Back to the Future Film".Even if it is possible, I would always wonder, this issue will definitely concern human right, perhaps the same issue concerning human clone. Ok, let’s say you failed in your exam, you go back to the past and re-sit for that paper. Ha, definitely you had memorized all the perfect answers. Eventually, you pass with flying colors. That’s dirty.
For me, there are pros and cons. One of the pro is that, if u murdered someone, you can undo it. Isn’t it great? Haha.. just my silly theory of it.
Now let me show you the real answer for it (picked from “The Life Explorer Magazine”)
Possible or Not?
This is the question everyone would love to answer. Time travel has been a favorite theme of science fiction novels. And some of it is actual fact. For example, it has been proven possible to travel forwards in time. Einstein’s theory of relativity predicts that an observer moving relative to Earth can leap into Earth’s future, and the effect has been confirmed using atomic clocks.
Going back in time is not as easy. Relativity does not rule out the possibility of travelling back in time, but all the scenarios so far require very exclusive circumstances. One way to go back in time is to use a wormhole in space. Theorists speculate that such a tunnel – or star gate – lining two points in space-time, really might exist. If this is true, then one could be adapted to form a time machine. You could go through it and exit not only somewhere else, but “somewhen” else too. And that could be the future or the past.
Issues arise if it is possible
If this were possible, then all sorts of problems and paradoxes could arise, namely, is it possible to alter the past or affect the future? It certainly seems too irrational for some physicists. Stephen Hawking suggested a “chronology protection conjecture”, surmising that something would intervene to prevent physical objects or influences looping back in time. For example, quantum vacuum energy might surge without limit near the entrance to the wormhole, blocking it.
Hawking also noted that it is hard to get funding for time travel research. So it is likely that this issue will have to wait a long while to be proved or disproved.
Related:
Astronomers Find Most Ancient Planet
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Labels: interesting, opinions, physics, possible, question, space, technology, time travel
posted by Jason @ 4:17 PM,
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Astronomers Find Most Ancient Planet
Friday, December 15, 2006
Astronomers have detected the most ancient planet yet known orbiting a binary system thousands of light-years away. The new discovery indicates that planet formation in the Milky Way may have started sooner and been more widespread than previously believed. A report describing the find appears in the current issue of the journal Science.
In 1988, researchers discovered pulsar PSR B1620-26, a neutron star spinning about 100 times a second, in the 13-billion-year-old globular star cluster known as M4. Scientists soon found a white dwarf nearby and further observations located a third object in orbit around both, which astronomers thought was either a brown dwarf or a low-mass star.The new work, carried out by an international team led by Steinn Sigurdsson of Pennsylvania State University, indicates that the orbiting object is instead a planet with a mass 2.5 times that of Jupiter. Using the Hubble Space Telescope, the team inferred the weight of the planet from its effects on the pulsar, thereby determining that it was too small to be either a star or a brown dwarf. "This is tremendously encouraging that planets are probably abundant in globular star clusters," notes study co-author Harvey Richer of the University of British Columbia.
Because globular clusters have low concentration of heavy elements-necessary building blocks for planets-scientist believed that they were unsuitable as planet breeding grounds. Indeed, the metal content of M4 is just 5 percent of that of our sun. Our Hubble measurement offers tantalizing evidence that planet formation processes are quite robust and efficient at making use a small amount of heavier elements. This implies that planet formation happened very early in the universe.
I I I Labels: ancient, astronomers, M4, most, planet, space
posted by Jason @ 10:49 PM,
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