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Dark Patch
| Description |
Dark Patch |
| Full Description |
The ancient and battered surface of Saturn's moon Rhea shows a notable dark swath of territory near the eastern limb in this image from Cassini. This view shows principally the Saturn-facing hemisphere on Rhea (1,528 kilometers, or 949 miles across). North is up and tilted 40 degrees to the right. The image was taken with the Cassini spacecraft narrow-angle camera on March 7, 2005, through a filter sensitive to wavelengths of ultraviolet light centered at 338 nanometers. The view was acquired at a distance of approximately 1.8 million kilometers (1.1 million miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 30 degrees. Resolution in the original image was 10 kilometers (7 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of two to aid visibility. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute, Boulder, Colo. For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov . For additional images visit the Cassini imaging team homepage http://ciclops.org . *Credit:* NASA/JPL/Space Science Institute |
| Date |
April 19, 2005 |
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Haze Over Eastern United Sta
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| Title |
Haze Over Eastern United States |
| Description |
Haze hung over the U.S. East Coast on April 19, 2005, lowering the air quality in many eastern cities, though none reached the EPA's "Code Red" category?unhealthy?. In a few cities, the levels of ozone and particulate matter 2.5 micrometers in diameter or larger entered the range of orange, which indicates the air could be unhealthy for people in sensitive groups, such as the elderly or people with respiratory conditions like asthma. This image of the area was captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA?s Terra satellite and stretches from New York southward to North Carolina, encompassing several large Eastern cities, including New York City, Philadelphia, Baltimore, and Washington, D.C. The grayish haze extends outward over the Atlantic Ocean (image right). For more on regional and national air pollution, visit the Environmental Protection Agency?s Air Now [ http://www.epa.gov/airnow/index.html ] Website. To read about how NASA satellite data help air quality forecasters to predict regional air quality, read the feature story A New IDEA in Air Quality Forecasting. [ http://earthobservatory.nasa.gov/Study/IDEA/ ] Image courtesy the MODIS Rapid Response Team, NASA-Goddard Space Flight Center |
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