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post #1 of 2 (permalink) Old 04-08-2004, 01:44 PM Thread Starter
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Sedna

Have you heard of the 10th planet in our solar system. Sedna was discovered a couple of months ago. I LOVE astronamy so I read about it all the time. Sedna was found behind Pluto and was the cause of Pluto's strange orbital path. By the way.....Did anyone hear about that black hole? The one that was recorded tearing up a nearby star. Scientists were able to record it on video using a Brazilian Telescope. Are there any other astronamy lovers here?
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post #2 of 2 (permalink) Old 04-08-2004, 02:55 PM
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Diana , I like astronomy too. This is new to me, though, because I don't get any science magazines any more, and have not seen this on any of the educational channels. According to spacedaily.com, it is probably too small to be considered a planet, and Pluto might not meet the requirements. Here's an exerpt from a recent article from that site:

........Trujillo has begun to examine the object's surface with one of the world's largest optical/infrared telescopes on Mauna Kea, Hawaii, but what the trio has been able to determine thus far is that Sedna is a planetoid a little smaller in size than Pluto with a highly elliptical orbit.

Sedna moves in a 10,500-year orbit around the Sun, approaching it only briefly.

The planetoid will become brighter over the next 72 years, then dim as it moves farther away on its 10,500-year trip to the farthest reaches of the solar system.

"The last time Sedna was this close to the Sun, Earth was just coming out of the last ice age," said Brown. "The next time it comes back, the world might again be a completely different place."

At its most distant, it is 130 billion kilometers (84 billion miles) from the Earth, or 900 times the distance between the Earth and the Sun.

Brown estimates Sedna's size at somewhere between Pluto and the planetoid Quaoar, measuring about 1,700 kilometers (1,000 miles) in diameter.

On that reckoning, it does not rise to the level of a planet. "It is not massive enough," he told reporters during a teleconference from NASA's Jet Propulsion Laboratory Monday.......
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It's very interesting, though! No I don't know about that black hole.




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