whywontgodhealamputees.com

Main Discussion Zone => Science => Topic started by: Frank on October 29, 2008, 02:05:15 PM

Title: Evidence found of solar system around nearby star
Post by: Frank on October 29, 2008, 02:05:15 PM
Quote
For the first time, astronomers think that they've found evidence of an alien solar system around a star close enough to Earth to be visible to the naked eye.

They say that at least one and probably three or more planets are orbiting the star Epsilon Eridani, 10.5 light-years — about 63 trillion miles — from Earth. Only eight stars are closer.

The host star, slightly smaller and cooler than our sun, is in the constellation Eridanus — the name of a mythological river — near Orion in the northern sky.

Epsilon Eridani is much younger than the sun, about 850 million years old compared with 4.5 billion years for our system.

"This really is a system like our solar system was when it was five times younger than it is now," said one of the discoverers, Massimo Marengo, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass. "It's like a time machine for our solar system.

(http://media.mcclatchydc.com/smedia/2008/10/24/16/377-20081024-SOLARSYSTEM.large.prod_affiliate.91.jpg)
http://www.mcclatchydc.com/homepage/story/54746.html

Consider this. If there is any life evolving on those planets by the time they reach the level we're at now their astronomers will see a super nova in their sky. It will be our sun exploding and vaporising the earth. Of course in the meantime we can invade their planet, exterminate them all with our high tech death rays, and then move in.
Title: Re: Evidence found of solar system around nearby star
Post by: velkyn on October 29, 2008, 02:45:53 PM
very cool.  Well, nothing says that evolution has to take a certain period of time, but I would agree, longer is probably better. 

quite a popular place in science fiction: http://en.wikipedia.org/wiki/Epsilon_Eridani_in_fiction

Title: Re: Evidence found of solar system around nearby star
Post by: Calilasseia on November 06, 2008, 01:37:38 AM
Consider this. If there is any life evolving on those planets by the time they reach the level we're at now their astronomers will see a super nova in their sky. It will be our sun exploding and vaporising the earth. Of course in the meantime we can invade their planet, exterminate them all with our high tech death rays, and then move in.

Well, actually, they won't see our Sun become a supernova. It isn't massive enough. If it had been massive enough from the very start to run all the way through helium, carbon, oxygen, neon, magnesium and silicon fusion, we wouldn't be here talking about it because [1] it would have been a Type O supergiant with a radius greater than the current radius of Earth's orbit, and [2] it would have used up its hydrogen stocks in around 10 to 20 million years, which means it would have entered the supernova phase long before basic abiogenetic processes could have led to the first protocells. Always assuming of course that there existed a planet in orbit around such a hypothetical Type O "Sun" at the right distance for those processes to begin that had managed to accrete and cool down to the right temperature in just 10-20 million years, which is again unlikely.

What will happen is that the Sun will expand its envelope as hydrogen stock are depleted, move on to helium fusion at the core, then shed a large part of its mass in a so-called 'planetary nebula' before settling down to a long, slow end as a white dwarf. However, this won't happen for another 5 billion years.
Title: Re: Evidence found of solar system around nearby star
Post by: Frank on November 06, 2008, 11:34:38 AM
Consider this. If there is any life evolving on those planets by the time they reach the level we're at now their astronomers will see a super nova in their sky. It will be our sun exploding and vaporising the earth. Of course in the meantime we can invade their planet, exterminate them all with our high tech death rays, and then move in.

Well, actually, they won't see our Sun become a supernova. It isn't massive enough. If it had been massive enough from the very start to run all the way through helium, carbon, oxygen, neon, magnesium and silicon fusion, we wouldn't be here talking about it because [1] it would have been a Type O supergiant with a radius greater than the current radius of Earth's orbit, and [2] it would have used up its hydrogen stocks in around 10 to 20 million years, which means it would have entered the supernova phase long before basic abiogenetic processes could have led to the first protocells. Always assuming of course that there existed a planet in orbit around such a hypothetical Type O "Sun" at the right distance for those processes to begin that had managed to accrete and cool down to the right temperature in just 10-20 million years, which is again unlikely.

What will happen is that the Sun will expand its envelope as hydrogen stock are depleted, move on to helium fusion at the core, then shed a large part of its mass in a so-called 'planetary nebula' before settling down to a long, slow end as a white dwarf. However, this won't happen for another 5 billion years.


So does this mean we won't be able to invade their planet and exterminate them with our high tech death rays just like aliens are always trying to do to us in all those sci fi movies?
Title: Re: Evidence found of solar system around nearby star
Post by: velkyn on November 06, 2008, 02:16:00 PM
Consider this. If there is any life evolving on those planets by the time they reach the level we're at now their astronomers will see a super nova in their sky. It will be our sun exploding and vaporising the earth. Of course in the meantime we can invade their planet, exterminate them all with our high tech death rays, and then move in.

Well, actually, they won't see our Sun become a supernova. It isn't massive enough. If it had been massive enough from the very start to run all the way through helium, carbon, oxygen, neon, magnesium and silicon fusion, we wouldn't be here talking about it because [1] it would have been a Type O supergiant with a radius greater than the current radius of Earth's orbit, and [2] it would have used up its hydrogen stocks in around 10 to 20 million years, which means it would have entered the supernova phase long before basic abiogenetic processes could have led to the first protocells. Always assuming of course that there existed a planet in orbit around such a hypothetical Type O "Sun" at the right distance for those processes to begin that had managed to accrete and cool down to the right temperature in just 10-20 million years, which is again unlikely.

What will happen is that the Sun will expand its envelope as hydrogen stock are depleted, move on to helium fusion at the core, then shed a large part of its mass in a so-called 'planetary nebula' before settling down to a long, slow end as a white dwarf. However, this won't happen for another 5 billion years.


So does this mean we won't be able to invade their planet and exterminate them with our high tech death rays just like aliens are always trying to do to us in all those sci fi movies?

just invent a "warp drive" and we can invade all you want  ;D
Title: Re: Evidence found of solar system around nearby star
Post by: Backspace on November 06, 2008, 03:16:59 PM
What makes a solar system "alien"?
Title: Re: Evidence found of solar system around nearby star
Post by: Azdgari on November 06, 2008, 03:17:48 PM
I think it has something to do with it not being our own.  ;)