September 6, 2013

Spacecraft to explore atmosphere of moon

The probe's rocket should be visible late Friday from much of the East Coast and as far north as Maine.

By MARCIA DUNN The Associated Press

CAPE CANAVERAL, Fla. - NASA is headed back to the moon, this time to explore its thin atmosphere and rough dust.

The robotic spacecraft LADEE will fly to the moon by way of Virginia's Eastern Shore. Liftoff is set for late Friday from NASA's Wallops Flight Facility.

Weather permitting, the soaring Minotaur rocket should be visible along much of the East Coast -- as far south as South Carolina, as far north as Maine and as far west as Pittsburgh.

LADEE -- short for Lunar Atmosphere and Dust Environment Explorer -- will be the first spacecraft to be launched into outer space from Wallops. And it will be the first moonshot ever from Virginia in 54 years of lunar missions.

The unmanned Minotaur rocket consists of converted intercontinental ballistic missile motors. A peace treaty between the United States and Russia specifies the acceptable launch sites for those missile parts; Wallops is on that short list.

All but one of NASA's approximately 40 moon missions -- most memorably the manned Apollo flights of the late 1960s and early 1970s -- originated from Cape Canaveral. The most recent were the twin Grail spacecraft launched two years ago this weekend. The lone exception, Clementine, a military-NASA venture, rocketed away from Southern California in 1994.

Scientists involved in the $280 million, moon-orbiting mission want to examine the lunar atmosphere -- yes, that's right, the moon's atmosphere.

"Sometimes, people are a little taken aback when we start talking about the lunar atmosphere because, right, we were told in school that the moon doesn't have an atmosphere," said Sarah Noble, NASA program scientist. "It does. It's just really, really thin."

The atmosphere is so thin and delicate, in fact, that spacecraft landings can disturb it. So now is the time to go, Noble said, before other countries and even private companies start bombarding the moon and fouling up the atmosphere.

Just last week, China announced plans to launch a lunar lander by year's end.

Earth's moon is relatively close, and by studying its atmosphere, scientists will learn about similar atmospheres in places farther afield, Noble said.

Scientists also are eager to measure the lunar dust and see whether the abrasive, equipment-clogging particles actually levitate right off the surface. None of the previous moon missions focused exclusively on the atmosphere and dust.

It will take LADEE -- the size of a small car coming in under 1,000 pounds -- one month to get close enough to the moon to go into lunar orbit, followed by another month to check its three scientific instruments. Then the spacecraft will be maneuvered from 30 miles to 90 miles above the lunar surface, where it will collect data for just over three months.

The mission will last six months and end with a suicide plunge into the moon.

 

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