NASA's next moon shot — a robotic spacecraft tasked with investigating lunar dust and the moon's thin atmosphere — is set to launch from Virginia this week.
The Lunar Atmosphere and Dust Environment Explorer (LADEE for short) is scheduled to start its journey to the moon on Friday (Sept. 6) at 11:27 p.m. EDT (0327 Sept. 7 GMT), launching atop a Minotaur 5 rocket, the maiden voyage for the new booster.
Weather permitting, the launch may be visible to observers along the East Coast of the United States when the rocket lifts off from NASA's Wallops Flight Facility on Wallops Island, Va. [Photos: NASA's LADEE Moon Dust Mission in Pictures]
"I love this mission. LADEE is going to be fantastic," John Grunsfeld, associate administrator for NASA's science mission directorate, told reporters in a briefing on Aug. 22. "I'm getting really excited as we move to the launch pad first of all because it's going to the moon. Ever since I was a young boy like so many folks looking up at the sky I've wondered about the moon."
LADEE — pronounced "laddie," not "lady" — will probe the lunar atmosphere for signs of moon dust that could have created a distinct glow on the moon's horizon that Apollo astronauts saw before sunrise. Scientists think that the mysterious luminosity could have been created by charged dust above the surface of the moon.
The LADEE spacecraft will also use its instrumentation to examine the thin atmosphere of the moon, called a surface boundary exosphere. Many moons, plants and some large asteroids all have this kind of atmosphere making it the most common kind of atmosphere in the solar system, Sarah Noble, a LADEE program scientist said.
Investigating the moon's atmosphere could help scientists understand more about the nature of atmospheres on many other bodies in the solar system including the closest planet to the sun, Mercury.
"The interesting thing about Mercury is that we don't have any samples of Mercury's surface ..." Noble said. "On the moon, we actually already know what the rocks are at the surface, but [LADEE] will help to compare what is on the surface versus what is in the atmosphere on the moon. [This science] will actually help us work our way back to Mercury and understand the difference between what we're seeing in the atmosphere and what might be on the ground there. We're actually going to learn about Mercury even from this lunar mission."
Once launched, LADEE will take 30 days to make it into its final orbit around the moon. The probe could make it to the Earth's cosmic neighbor in less time, but it would use too much fuel getting there, mission scientists said.
Fuel on LADEE needs to be conserved in order to perform the 100 days of science scheduled for the spacecraft's mission. The probe will be put into a relatively low orbit and because the moon's gravity is lumpy, LADEE needs a significant amount of fuel to stay stable in its orbit.
"With the Lunar Reconnaissance Orbiter — which is still in orbit around the moon — we've learned an enormous amount about the surface of the moon," Grunsfeld said. "With GRAIL we studied the interior of the moon, and now with LADEE we're going to learn about the moon's atmosphere which is something very mysterious and we know very little about. This is a particularly exciting mission for us."
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