Propellantless propulsion from plain-old Special Relativity

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GIThruster
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Re: Propellantless propulsion from plain-old Special Relativ

Postby GIThruster » Fri Mar 27, 2015 1:59 pm

"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

paperburn1
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Re: Propellantless propulsion from plain-old Special Relativ

Postby paperburn1 » Sat Mar 28, 2015 12:00 am

I have to agree, Bill Nye is a television personality first, and sort of a scientist second.After all he supported the 2006 reclassification of Pluto from planet to dwarf planet .
I am not a nuclear physicist, but play one on the internet.

AcesHigh
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Re: Propellantless propulsion from plain-old Special Relativ

Postby AcesHigh » Sat Mar 28, 2015 2:01 am

are you saying that anyone who supported the reclassification is not a real scientist? :roll:

Diogenes
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Re: Propellantless propulsion from plain-old Special Relativ

Postby Diogenes » Sat Mar 28, 2015 2:50 pm

‘What all the wise men promised has not happened, and what all the damned fools said would happen has come to pass.’
— Lord Melbourne —

DeltaV
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Re: Propellantless propulsion from plain-old Special Relativ

Postby DeltaV » Sat Mar 28, 2015 3:46 pm


DeltaV
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Re: Propellantless propulsion from plain-old Special Relativ

Postby DeltaV » Sat Mar 28, 2015 4:08 pm

Not in the arXiv version (no doubt a reviewer-prompted change)... does not invalidate the claims (orange box).
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GIThruster
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Re: Propellantless propulsion from plain-old Special Relativ

Postby GIThruster » Sat Mar 28, 2015 4:53 pm

"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

kurt9
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Re: Propellantless propulsion from plain-old Special Relativ

Postby kurt9 » Sat Mar 28, 2015 6:10 pm


AcesHigh
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Re: Propellantless propulsion from plain-old Special Relativ

Postby AcesHigh » Sun Mar 29, 2015 1:02 am


D Tibbets
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Re: Propellantless propulsion from plain-old Special Relativ

Postby D Tibbets » Sun Mar 29, 2015 4:25 am

Sorry to contribute to the topic drift, but...

The recent decision of the criteria for a planet is arbitrary and foolish. The requirement for the body to be large enough to gravitationally form a sphere is reasonable, but how perfect of a sphere do you need? The Earth is egg shaped, and what about mountains?

Clearing out everything in it's orbit is the other criteria. Again, it is a matter of scale. Jupiter is certainly good at collecting or dispersing dust and other objects from nearby. But it still hasn't cleared out its orbit, mostly because it is a continuous process, even after billions of years things are still colliding with Jupiter. There is always new stuff entering the domain where the gravity of a body perturbes it . Only the scale is different. Ceres has cleared it's orbit just as well as Jupiter, as has Vesta, or any other rock that has survived to the current age of the Solar system.

You might argue that Pluto is not a planet because it is in a resonant orbit with Neptune, but you could reverse that argument and say that Neptune is not a planet. You could say that only the larger body could be a planet, but what about other star systems? If you have two bodies like Neptune and Uranus that is in a resonate orbit, which do you reject as a planet? Note that a resonant orbit is not the same as being a trogen. In that case it would be difficult to justify a planet designation. But, what if a Earth like object was in a trojan orbit with a super Jupiter. Would it be a planet?

The argument that Pluto is similar in size to several additional "trans-Neptunian objects" , thus does not deserve the title of a planet can be equally reversed and the newly discovered bodies should be called planets based on sphericity. I think Mercury fits into this situation as well. Which direction you go is only a cultural bias. Oh no, we can't have 30 planets, how would we calculate our horiscopes!

Only the requirement for sphericity (within some arguable limits) is a definitive measure, along with survival over the age of the star system (implies it has cleared it's orbit to any meaningful extent) . What of a perfectly acceptable planet like Earth that is ejected from a star system by a super Jupiter or a binary star. Is it no longer a planet if it is not orbiting a star?

The new naming system is designed specifically to exclude Pluto, and the criteria are imprecise even so. It is a political and cultural decision and has little if any use for describing star system formation or evolution. Note that this reasoning would place Ceres as a planet. That is fine. At least it would be consistent. Defining a dwarf planet as being under some defined radius (again calls up consideration of Mercury) is also fine, but I do not think they wanted to ventured that far.

Dan Tibbets
To error is human... and I'm very human.

paperburn1
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Re: Propellantless propulsion from plain-old Special Relativ

Postby paperburn1 » Sun Mar 29, 2015 2:20 pm

Well stated Mr. Tibbets
or in a more youthful parlance "What he said!"
And on one other note Then.., why is a strawberry called so? it is a fruit not a berry. A banana is a berry but it is referred as a fruit and I do not even want to get started on Tomato and eggplants which are legally vegetables but in reality berries so declared by the supreme court (1893 case of Nix v. Hedden)
So because of rules Pluto is not a planet. Just because a group of men gather and say something does not make it correct.

I was born with nine planets in the sky and will most likely die with the same belief.

:lol: Warning signification thread drift :lol:
Last edited by paperburn1 on Sun Mar 29, 2015 3:15 pm, edited 1 time in total.
I am not a nuclear physicist, but play one on the internet.

paperburn1
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Re: Propellantless propulsion from plain-old Special Relativ

Postby paperburn1 » Sun Mar 29, 2015 3:14 pm

I am not a nuclear physicist, but play one on the internet.

AcesHigh
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Re: Propellantless propulsion from plain-old Special Relativ

Postby AcesHigh » Mon Mar 30, 2015 1:48 am


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Re: Propellantless propulsion from plain-old Special Relativ

Postby palladin9479 » Mon Mar 30, 2015 2:33 am


AcesHigh
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Re: Propellantless propulsion from plain-old Special Relativ

Postby AcesHigh » Mon Mar 30, 2015 1:36 pm



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