[Physics] Martian meteorites

[Thomas Goodey]

On 13 Oct 2017 at 12:00, cj at mb-soft.com wrote:

> All sorts of "scientists" claim that countless
> meterorites they find, especially in Antarctica, came
> from Mars.  No one seems to have done ANY of the math
> necessary to make such a  statement. 

cj at mb-soft.com, your nonsense is getting worse and worse. 
Do you suppose that you are the only person who can do 
simple arithmetic? Of course all scientists having anything 
to do with Mars know perfectly well what the escape 
velocity is.

You seem to be completely ignorant of the fact that the 
solid reason that the scientific community knows these 
meteorites come from Mars, is that they have the correct 
isotopic composition - the Martian isotopic composition 
having been determined by the Viking landers, long ago.

> First, they must not realize the enormous and powerful
> rockets we must use in getting to Mars. 

A super-idiot thinks everybody else is an idiot.

> Doing the math regarding such things, incluuding the
> rarity of huge asteroids crashing into the tiny planet
> Mars, is sort of hilarious. 

Say after me, "Late Heavy Bombardment".

> Third, they FIND their objects near the surface of 
> Antarctic.

They find very large numbers of meteorites on the surface 
of the Antarctic ice, in locations where they tend to 
collect due to the movements of the ice.

>  Do they not realize that such a meteorite had
> just gone through our atmosphere and gotten white hot with
> friction, and it is coming down at 20,000 mph or faster. 

Most meteorites of modest size hit the ground at terminal 
velocity (falling velocity for their size), and are not hot 
when they reach the ground.

> In a continent which is covered with thousands of feet
> thick ice, I would tend to wonder whether it might get
> entirely through the thick ice in a twenty-thousandth of
> a second to hit bedrock. 

Then you'd wonder wrong.

> But they wander around Antarctica looking for
> objects at or near the surface.  

And they find large numbers of them. From their structure 
they are obviously meteorites, and, in any case, I'd like 
to see how you would think lumps of rock could get up to 
the top of the ice sheet anyway.

Thomas Goodey

*****************************
Anne's search for security 
holes in the localizer network 
software was close to 
impossible. Every year her 
zipheads pushed back their 
deadline for certainty another 
year or two. But the quagmire 
of Qeng Ho fleet software 
was almost eight thousand 
years deep.
--------- Vernor Vinge
----------'A Deepness in the Sky'