Volatiles Power Early Activity
Observations by the NASA Swift spacecraft suggests the early activity of Comet ISON is not from water ice melting when the comet is still far from the 100 mg cialis sun, about 460 million miles. Swift indirectly detects the presence of water, and found ISON was dumping copious abounts of viagra injectable dust (112,000 pounds) every minute but only minimal water (130 pounds).
In a NASA press release, Lead Investigator Dennis Bodewits, an astronomer at University of Maryland at College Park, said, "The mismatch we detect between the amount of dust and cialis 100 mg water produced tells us that ISON's water sublimation is not yet powering its jets because the comet is still too far from the sun. Other more volatile materials, such as carbon dioxide or carbon monoxide ice, evaporate at greater distances and are now fueling ISON's activity."
The dust and water values also suggest the comet is about 3 miles across.
The press release addressed the issue of ISON's likelihood of surviving the sungrazing:
"We estimate that as much as 10 percent of the follow link comet's diameter may erode away, but this probably won't devastate it," said astronomer Michael Knight. Nearly all of the energy reaching the comet acts to cheapest tramadol prescriptions sublimate its ice, an evaporative process that cools the comet's surface and keeps it from reaching extreme temperatures despite its proximity to the sun.