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Latest Planetary migration Stories

Standard Model Does Little To Explain Why Earth Is So Dry
2012-07-18 10:59:10

Lawrence LeBlond for redOrbit.com - Your Universe Online Despite seventy percent of the Earth´s surface being covered by water, in reality the whole of the planet is only made up of 1 percent water, making it relatively dry compared to the gas giants, such as Jupiter and Neptune. And now, that dryness, which has long perplexed scientists, has been explained by a team of scientists working at the Space Telescope Science Institute (STSI) in Baltimore, Maryland. The standard model...

Study Sheds Light On Planetary Orbital Pile-Ups
2012-03-20 08:32:57

Researchers said they have found why some orbits seen in young solar systems seem to be more popular than others. Astronomers have been puzzled as to why giant gas planets like Jupiter and Saturn appear to occupy certain regions in mature solar systems while staying clear of others. Ilaria Pascucci, an assistant professor at the University of Arizona's Lunar and Planetary Laboratory, said the final distribution of planets does not vary smoothly with distance from the star, but has clear...

Solar System Ejected A Giant Planet 600 Million Years Ago
2011-11-11 06:10:42

According to a study published in The Astrophysical Journal Letters, our solar system may have ejected a giant planet from its orbit and spared the Earth. Experts wrote that Jupiter had helped eject another giant planet from our solar system when it was about 600 million years old. "We have all sorts of clues about the early evolution of the solar system," author Dr. David Nesvorny of the Southwest Research Institute said in a press release. "They come from the analysis of the...

2011-06-06 19:44:24

Planetary scientists have long wondered why Mars is only about half the size and one-tenth the mass of Earth. As next-door neighbors in the inner solar system, probably formed about the same time, why isn't Mars more like Earth and Venus in size and mass? A paper published in the journal Nature this week provides the first cohesive explanation and, by doing so, reveals an unexpected twist in the early lives of Jupiter and Saturn as well. Dr. Kevin Walsh, a research scientist at Southwest...

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2010-01-07 12:05:00

New simulation presented at astronomy meeting reveals planet migration prevents plunge into sun For the last 20 years, the best models of planet formation"”or how planets grow from dust in a gas disk"”have contradicted the very existence of Earth. These models assumed locally constant temperatures within a disk, and the planets plunge into the Sun. Now, new simulations from researchers at the American Museum of Natural History and the University of Cambridge show that variations...

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2009-02-25 14:50:00

The patterns of missing asteroids are like the footprints of wandering giant planets preserved in the asteroid belt. University of Arizona scientists have uncovered a curious case of missing asteroids. The main asteroid belt is a zone containing millions of rocky objects between the orbits of Mars and Jupiter. The scientists find that there ought to be more asteroids there than researchers observe. The missing asteroids may be evidence of an event that took place about 4 billion years ago,...

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2007-08-24 12:46:19

The traditional belief that Jupiter acts as a celestial shield, deflecting asteroids and comets away from the inner Solar System, has been challenged by the first in a series of studies evaluating the impact risk to the Earth posed by different groups of object. On Friday 24th August at the European Planetary Science Congress in Potsdam, Dr Jonathan Horner will present a study of the impact hazard posed to Earth by the Centaurs, the parent population of the Jupiter Family of comets (JFCs)....

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2007-01-08 16:55:00

Gas-giant planets like Jupiter and Saturn form soon after their stars do, according to new research. Observations from NASA's Spitzer Space Telescope show that gas giants either form within the first 10 million years of a sun-like star's life, or not at all. The study offers new evidence that gas-giant planets must form early in a star's history. The lifespan of sun-like stars is about 10 billion years. Ilaria Pascucci of the University of Arizona Steward Observatory in Tucson led a team of...

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2006-06-07 07:50:00

Astronomers from McMaster University in Hamilton, Ontario find that "dead zones"- which typically extend out to 13 astronomical units from the central star of an extrasolar planetary system - can significantly slow planetary migration so that planets are not lost to the systems. This release summarizes work to be described in a press conference at the American Astronomical Society meeting in Calgary, Alberta on June 5, 2006, and in an invited talk at a scientific session during the meeting....

2005-12-15 16:05:00

WASHINGTON (Reuters) - A distant object named Buffy has been spotted circling the sun far beyond Neptune in a strange tilted orbit that is making some astronomers question how the outer reaches of the solar system formed. Officially called 2004 XR 190 by the International Astronomical Union but code-named Buffy, the object is now about 58 times as far from the sun as Earth, and twice as far from the sun as Neptune. At this distance from the heart of the planetary system, Buffy is a considered...


Word of the Day
penuche
  • A fudgelike confection of brown sugar, cream or milk, and chopped nuts.
'Penuche' is a variant of 'panocha,' a coarse grade of sugar made in Mexico. 'Panocha' probably comes from the Spanish 'panoja, panocha,' ear of grain.
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