NASA Finds Evidence of Plume from Lunar Probes
A week after smashing two probes into the moon, NASA says early data returns are tantalizing and even reveal traces of an impact plume. A worldwide audience was disappointed when the Oct. 9 bombing of the moon failed to produce what NASA had said would be a 6-mile-high plume of dirt and debris.NASA is calling last week's bombing of the moon a smashing success with the two probes that smacked into the lunar surface Oct. 9 returning tantalizing data, including faint traces of an impact plume. NASA has said it ultimately hopes the probes will yield data about the possibility of water on the moon. NASA launched an Atlas V rocket to the moon June 18 with two satellites riding on top: the LRO (Lunar Reconnaissance Orbiter) and the LCROSS (Lunar Crater Observation and Sensing Satellite). The LRO is in orbit 31 miles above the moon's surface, mapping the moon in high resolution for future landing sites and gathering crucial data on the lunar environment that will help astronauts prepare for long-duration lunar expeditions.
NASA dropped the LCROSS with the empty 2.5 ton Centaur upper stage of the Atlas rocket still attached out of orbit late Oct. 8 and begin angling for the lunar surface. The Centaur hit the surface first, closely followed by the LCROSS.
"The magnitude, form and visibility of the debris plume add additional information about the concentrations and state of the material at the [Cabeus crater] impact site."The images of the floor of Cabeus are exciting," Colaprete said. "Being able to image the Centaur crater helps us reconstruct the impact process, which in turn helps us understand the observations of the flash and ejecta plume." NASA also posted some initial images of the impacts on the LCROSS site.
"The LCROSS spacecraft also captured the Centaur impact flash in both mid-infrared (MIR) thermal cameras over a couple of seconds. The temperature of the flash provides valuable information about the composition of the material at the impact site. LCROSS also captured emissions and absorption spectra across the flash using an ultraviolet/visible spectrometer. Different materials release or absorb energy at specific wavelengths that are measurable by the spectrometers."