Comment Re:not much historic data on hole (Score 1) 436
Also, let's not forget that 7 astronauts indirectly lost their lives because of our concern for this so-called "hole in the Ozone Layer."
We were so worried about the use of spray-on CFC-14 affecting the ozone layer, that in 1995, we switched to glued-on HCFC 141b foam. Guess what? Glue doesn't stick very well to a tank that contains liquid nitrogen and liquid hydrogen. Try gluing a piece of foam to a frozen metal pole that is vibrating. Good luck.
It was that glued-on foam that broke away from the external tank and struck Columbia's right wing reinforced carbon-carbon tiles, which in-turn led to the orbiter's break-up during re-entry.
So, boy, we *think* we helped save the ozone layer ... in theory. But it's NO THEORY that 7 astronauts died on STS-107.
Does man really think he is so MIGHTY and significant in this world that he can actually open and close the ozone layer by using or not using aerosol spray cans? Chew on this: the ozone layer is directly influenced by solar activity. That's right - the SUN dictates how our atmosphere behaves (any ham radio operator can vouch for the solar cycle influencing the ionosphere), not man. I think we're mighty ARROGANT to assume we have any significant influence on our GLOBAL environment.
We were so worried about the use of spray-on CFC-14 affecting the ozone layer, that in 1995, we switched to glued-on HCFC 141b foam. Guess what? Glue doesn't stick very well to a tank that contains liquid nitrogen and liquid hydrogen. Try gluing a piece of foam to a frozen metal pole that is vibrating. Good luck.
It was that glued-on foam that broke away from the external tank and struck Columbia's right wing reinforced carbon-carbon tiles, which in-turn led to the orbiter's break-up during re-entry.
So, boy, we *think* we helped save the ozone layer
Does man really think he is so MIGHTY and significant in this world that he can actually open and close the ozone layer by using or not using aerosol spray cans? Chew on this: the ozone layer is directly influenced by solar activity. That's right - the SUN dictates how our atmosphere behaves (any ham radio operator can vouch for the solar cycle influencing the ionosphere), not man. I think we're mighty ARROGANT to assume we have any significant influence on our GLOBAL environment.
