new photo blog

i started this blog in 2006, and it's shifted along with my interests through the years. it's been witness to a lot of learning for me...

still, i feel that i need a home for my photography -- so from now on, i'll be posting my pictures on the journal on my reworked website. if you like my photos, you might decide to follow me there!

my first post is here -- check it out!

as for this blog, i'm not sure what will happen. i don't think i'm willing to let it go, and certainly i'll keep it as an archive, but i need some time to figure it out.

for those of you that pop in from time to time, thanks for the visits and encouragement.

Thursday, July 23, 2009

saturnian moon shows evidence of ammonia

via JPL and reposted in full:

'data collected during two close flybys of saturn's moon enceladus by NASA's cassini spacecraft add more fuel to the fire about the saturnian ice world containing sub-surface liquid water. the data collected by cassini's ion and neutral mass spectrometer during enceladus flybys in july and oct. 2008, were released in the july 23 issue of the journal nature.

"when cassini flew through the plume erupting from enceladus on october 8 of last year, our spectrometer was able to sniff out many complex chemicals, including organic ones, in the vapor and icy particles," said hunter waite, the cassini ion and neutral mass spectrometer lead scientist from the southwest research institute in san antonio, texas. "one of the chemicals definitively identified was ammonia."

on earth, the presence of ammonia means the potential for sparkling clean floors and counter tops. in space, the presence of ammonia provides strong evidence for the existence of at least some liquid water.

how could ammonia equate to liquid water inside an ice-covered moon in one of the chillier neighborhoods of our solar system? as many a homeowner interested in keeping their abodes spick and span know, ammonia promptly dissolves in water. but what many people do not realize is that ammonia acts as antifreeze, keeping water liquid at lower temperatures than would otherwise be possible. with the presence of ammonia, water can exist in a liquid state to temperatures as low as 176 degrees kelvin (-143 degrees fahrenheit).

"given that temperatures in excess of 180 kelvin (-136 degrees fahrenheit) have been measured near the fractures on enceladus where the jets emanate, we think we have an excellent argument for a liquid water interior," said waite.

cassini discovered water vapor and particles spewing from enceladus in 2005. since then, scientists have been trying to determine if the plume originates from a liquid source inside the moon or is due to other causes.

"ammonia is sort of a holy grail for icy volcanism," said william mckinnon, a scientist from washington university in saint louis, missouri. "this is the first time we've found it for sure on an icy satellite of a giant planet. it is probably everywhere in the saturn system."

just how much water is contained within enceladus' icy interior is still up for debate. so far, cassini has made five flybys of enceladus, one of the chief targets for cassini's extended mission. two close flybys are scheduled for november of this year, and two more close flybys are scheduled for april and may or 2010. data collected during these future flybys may help settle the debate.

"where liquid water and organics exist, is there life?" asked jonathan lunine a cassini scientist from the university of arizona, tucson. "such is the case for earth; what was found on enceladus bolsters this moon's promise for containing potential habitable environments."

the cassini-huygens mission is a cooperative project of NASA, the european space agency and the italian space agency. the cassini orbiter was designed, developed and assembled at jpl. jpl manages the mission for the science mission directorate at NASA headquarters in washington.'

also here and here

No comments:

Post a Comment