Penelitian ahli ilmu falak sudah begitu jauh...
Tapi orang Islam yang ber IQ rendah dan dungu-dunguy kayak anjing serta tidak
punyaharga diri seperti Abbas Amin, arra_s, ayub yahya, Dipo, johny-indon,
PAREWA PAREWA, Pinpin, rezameutia, Roman Proteus safin_blanc dll. itu masih
saja bersedia melahap omong kosong orang Arab primitif yang membual tentang
tahayul allah hasil khayalan orang Arab primitif itu menciptakan bumi yang
tujuh lapis dan langit yang tujuh lapis...
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Web address:
http://www.sciencedaily.com/releases/2012/07/
120726111352.htm
Orientation of Far-Off Multiplanet System Has Orientation Very Similar to Our
Own Solar System
In this artist interpretation, the planet Kepler-30c is transiting one of the
large starspots that frequently appear on the surface of its host star. The
authors used these spot-crossing events to show that the orbits of the three
planets (color lines) are aligned with the rotation of the star (curly white
arrow). (Credit: Graphic by Cristina Sanchis Ojeda)
ScienceDaily (July 26, 2012) Our solar system exhibits a remarkably orderly
configuration: The eight planets orbit the sun much like runners on a track,
circling in their respective lanes and always keeping within the same sprawling
plane. In contrast, most exoplanets discovered in recent years -- particularly
the giants known as "hot Jupiters" -- inhabit far more eccentric orbits.
Now researchers at MIT, the University of California at Santa Cruz and other
institutions have detected the first exoplanetary system, 10,000 light years
away, with regularly aligned orbits similar to those in our solar system. At
the center of this faraway system is Kepler-30, a star as bright and massive as
the sun. After analyzing data from NASA's Kepler space telescope, the MIT
scientists and their colleagues discovered that the star -- much like the sun
-- rotates around a vertical axis and its three planets have orbits that are
all in the same plane.
"In our solar system, the trajectory of the planets is parallel to the rotation
of the sun, which shows they probably formed from a spinning disc," says
Roberto Sanchis-Ojeda, a physics graduate student at MIT who led the research
effort. "In this system, we show that the same thing happens."
Their findings, published July 25 in the journal Nature, may help explain the
origins of certain far-flung systems while shedding light on our own planetary
neighborhood.
"It's telling me that the solar system isn't some fluke," says Josh Winn, an
associate professor of physics at MIT and a co-author on the paper. "The fact
that the sun's rotation is lined up with the planets' orbits, that's probably
not some freak coincidence."
Setting the record straight on orbital tilts
Winn says the team's discovery may back a recent theory of how hot Jupiters
form. These giant bodies are named for their extremely close proximity to their
white-hot stars, completing an orbit in mere hours or days. Hot Jupiters'
orbits are typically off-kilter, and scientists have thought that such
misalignments might be a clue to their origins: Their orbits may have been
knocked askew in the very early, volatile period of a planetary system's
formation, when several giant planets may have come close enough to scatter
some planets out of the system while bringing others closer to their stars.
Recently, scientists have identified a number of hot Jupiter systems, all of
which have tilted orbits. But to really prove this "planetary scattering"
theory, Winn says researchers have to identify a non-hot Jupiter system, one
with planets circling farther from their star. If the system were aligned like
our solar system, with no orbital tilt, it would provide evidence that only hot
Jupiter systems are misaligned, formed as a result of planetary scattering.
Spotting sunspots in a far-off sun
In order to resolve the puzzle, Sanchis-Ojeda looked through data from the
Kepler space telescope, an instrument that monitors 150,000 stars for signs of
distant planets. He narrowed in on Kepler-30, a non-hot Jupiter system with
three planets, all with much longer orbits than a typical hot Jupiter. To
measure the alignment of the star, Sanchis-Ojeda tracked its sunspots, dark
splotches on the surface of bright stars like the sun.
"These little black blotches march across the star as it rotates," Winn says.
"If we could make an image, that'd be great, because you'd see exactly how the
star is oriented just by tracking these spots."
But stars like Kepler-30 are extremely far away, so capturing an image of them
is almost impossible: The only way to document such stars is by measuring the
small amount of light they give off. So the team looked for ways to track
sunspots using the light of these stars. Each time a planet transits -- or
crosses in front of -- such a star, it blocks a bit of starlight, which
astronomers see as a dip in light intensity. If a planet crosses a dark
sunspot, the amount of light blocked decreases, creating a blip in the data dip.
"If you get a blip of a sunspot, then the next time the planet comes around,
the same spot might have moved over here, and you'd see the blip not here but
there," Winn says. "So the timing of these blips is what we use to determine
the alignment of the star."
>From the data blips, Sanchis-Ojeda concluded that Kepler-30 rotates along an
>axis perpendicular to the orbital plane of its largest planet. The researchers
>then determined the alignment of the planets' orbits by studying the
>gravitational effects of one planet on another. By measuring the timing
>variations of planets as they transit the star, the team derived their
>respective orbital configurations, and found that all three planets are
>aligned along the same plane. The overall planetary structure, Sanchis-Ojeda
>found, looks much like our solar system.
James Lloyd, an assistant professor of astronomy at Cornell University who was
not involved in this research, says that studying planetary orbits may shed
light on how life evolved in the universe -- since in order to have a stable
climate suitable for life, a planet needs to be in a stable orbit. "In order to
understand how common life is in the universe, ultimately we will need to
understand how common stable planetary systems are," Lloyd says. "We may find
clues in extrasolar planetary systems to help understand the puzzles of the
solar system, and vice versa."
The findings from this first study of the alignment of a non-hot Jupiter system
suggest that hot Jupiter systems may indeed form via planetary scattering. To
know for sure, Winn says he and his colleagues plan to measure the orbits of
other far-off solar systems.
"We've been hungry for one like this, where it's not exactly like the solar
system, but at least it's more normal, where the planets and the star are
aligned with each other," Winn says. "It's the first case where we can say
that, besides the solar system."
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Story Source:
The above story is reprinted from materials provided by Massachusetts
Institute of Technology. The original article was written by Jennifer Chu, MIT
News Office.
Note: Materials may be edited for content and length. For further
information, please contact the source cited above.
Journal Reference:
Roberto Sanchis-Ojeda, Daniel C. Fabrycky, Joshua N. Winn, Thomas Barclay,
Bruce D. Clarke, Eric B. Ford, Jonathan J. Fortney, John C. Geary, Matthew J.
Holman, Andrew W. Howard, Jon M. Jenkins, David Koch, Jack J. Lissauer,
Geoffrey W. Marcy, Fergal Mullally, Darin Ragozzine, Shawn E. Seader, Martin
Still, Susan E. Thompson. Alignment of the stellar spin with the orbits of a
three-planet system. Nature, 2012; 487 (7408): 449 DOI: 10.1038/nature11301
Need to cite this story in your essay, paper, or report? Use one of the
following formats:
APA
MLA
Massachusetts Institute of Technology (2012, July 26). Orientation of far-off
multiplanet system has orientation very similar to our own solar system.
ScienceDaily. Retrieved July 26, 2012, from http://www.sciencedaily.com
/releases/2012/07/120726111352.htm
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of
ScienceDaily or its staff.
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