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Nemesis


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#1 Moving Target

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Posted 04 January 2016 - 10:07 AM

So I was watching an American docu about our Solar System and how our concept of it has changed radically in the last forty years.

 

Pluto got downgraded to 'dwarf planet' status because there are supposedly hundred of Plutonic objects out in the Kuiper Belt - we couldn't see them until recently.

 

Then there is the Heliosphere, Heliopause and Bow Shock protecting us from cosmic rays pumped out by nearby stars.  I get all that.

 

Further out is the Oort Cloud where the comets live in eccentric orbits.  Why do some of them decide to dive in toward the Sun, accelerating to 100 miles per second?  

 

The astrophysicists reckon there is a large object out there disturbing the paths of the comets, called Nemesis.  Is it a brown dwarf, or a gas giant?

 

Or is our own Oort Cloud disturbed by the Oort cloud of Alpha Centauri?

 

I bloody love space!  :D



#2 Slim

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Posted 04 January 2016 - 10:32 AM

Oh yes, the "death star" that supposedly hurls comets in our direction occasionally, triggering a mass extinction event.

 

I've just read this:

 

http://www.space.com...met-impact.html


Seems it's out of fashion now, but an interesting idea.



#3 Moving Target

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Posted 04 January 2016 - 12:14 PM

Nemesis meets its...... ah well.



#4 SJS

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Posted 05 January 2016 - 07:40 PM

Isaac Asimov wrote a novel called Nemesis about such an object approaching earth.  I need to re-read it: I don't remember the details.


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#5 Moving Target

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Posted 22 January 2016 - 02:52 PM


Seems it's out of fashion now, but an interesting idea.

 

 

Back in fashion again now! 

 

There is strong evidence of a planet with about ten times the mass of Earth at the outer rim of the Kuiper Belt.

 

Though not spotted yet.....



#6 Three Eyes

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Posted 22 January 2016 - 03:24 PM

nemesis_e3_1.jpg


Hey there goes Alex. He's loaded with money. Wow he's really set himself up great.


#7 A Rebel and a Runner

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Posted 22 January 2016 - 07:18 PM

I remember as a kid just thinking the phrase "Oort cloud" was funny when I read Anne McCaffrey's Dragonriders of Pern novels (which are pretty fun sci-fi/fantasy stories if you haven't read them)



#8 Slim

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Posted 23 January 2016 - 12:35 AM

Was that Nemesis film really 2002? Damn



#9 Three Eyes

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Posted 23 January 2016 - 01:07 AM

I had the same thought. It was the last of the Next Generation films.


Hey there goes Alex. He's loaded with money. Wow he's really set himself up great.


#10 grep

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Posted 23 January 2016 - 01:44 AM

I for one welcome our new planet.


Hey... How freaky would it be if that's where the gray aliens live? Huh?

Rogue-One-Death-Star-Installment.jpg

 

May The Force Be With Us...

 


#11 Moving Target

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Posted 23 January 2016 - 09:22 AM




Hey... How freaky would it be if that's where the gray aliens live? Huh?

 

Nothing could live on it.  Even nitrogen and methane would freeze out there.






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