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Latest Definition of planet Stories

2005-10-02 11:51:59

By Deborah Zabarenko WASHINGTON (Reuters) - Xena, the possible 10th planet in our solar system, has its own moon, a dim little satellite called Gabrielle, its discoverers reported. Astronomers who reported Xena's discovery in July said they detected Xena's sidekick on September 10 using the Keck Observatory on Mauna Kea in Hawaii. Their findings will be submitted to the Astrophysical Journal Letters on Monday. "Since the day we discovered Xena, the big question has been whether or...

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2005-10-02 00:55:00

LOS ANGELES -- The astronomers who claim to have discovered the 10th planet in the solar system have another intriguing announcement: It has a moon. While observing the new, so-called planet from Hawaii last month, a team of astronomers led by Michael Brown of the California Institute of Technology spotted a faint object trailing next to it. Because it was moving, astronomers ruled it was a moon and not a background star, which is stationary. The moon discovery is important because it can...

2005-08-01 08:01:18

By Gina Keating LOS ANGELES (Reuters) - A California astronomer has discovered what he believes is the 10th planet in our solar system, a group of NASA-funded researchers said on Friday. The new planet, known as 2003UB313, has been identified as the most distant object ever detected orbiting the sun, California Institute of Technology astronomer Michael Brown said. Brown and colleagues Chad Trujillo and David Rabinowitz have submitted a name for the planet to the International...

2005-07-29 20:50:35

By Gina Keating LOS ANGELES (Reuters) - A California astronomer has discovered what he believes is the 10th planet in our solar system, a group of NASA-funded researchers said on Friday. The new planet, known as 2003UB313, has been identified as the most distant object ever detected orbiting the sun, California Institute of Technology astronomer Michael Brown said. Brown and colleagues Chad Trujillo and David Rabinowitz have submitted a name for the planet to the International...

2005-07-14 12:27:22

CAPE CANAVERAL, Fla. (Reuters) - In a scenario out of "Star Wars," astronomers have detected a planet outside our solar system with not one, but three suns, a finding that challenges astronomers' theories of planetary formation. The planet, a gas giant slightly larger than Jupiter, orbits the main star of a triple-star system known as HD 188753 in the constellation Cygnus ("The Swan"). The stellar trio and its planet are about 149 light-years from Earth and about as close to each other as...

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2005-04-05 19:20:00

Cambridge, MA -- When the distant planetoid Sedna was discovered on the outer edges of our solar system, it posed a puzzle to scientists. Sedna appeared to be spinning very slowly compared to most solar system objects, completing one rotation every 20 days. Astronomers hypothesized that this world possessed an unseen moon whose gravity was slowing Sedna's spin. Yet Hubble Space Telescope images showed no sign of a moon large enough to affect Sedna. New measurements by Scott Gaudi, Krzysztof...

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2005-02-15 07:40:00

BLOOMINGTON, Ind. -- A new theory of how planets form finds havens of stability amid violent turbulence in the swirling gas that surrounds a young star. These protected areas are where planets can begin to form without being destroyed. The theory will be published in the February issue of the journal Icarus. "This is another way to get a planet started. It marries the two main theories of planet formation," said Richard Durisen, professor of astronomy and chair of that department at Indiana...

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2004-12-02 00:40:00

Close encounter may explain some objects beyond Neptune Cambridge, MA -- A hit TV program like "Antiques Roadshow" lures viewers with its universal appeal. Who wouldn't want to find secret riches in their attic or basement? But rare paintings and heirloom jewelry aren't the only valuable items waiting to be discovered. Cosmic treasures also lay hidden in the vast realm of outer space. Among the most highly prized of those treasures are planets that formed around other stars. Astronomers have...