An artist’s depiction of LADEE in orbit around the moon. (Dana Berry/NASA Ames)
A NASA mission designed here in the Bay Area has solved a 42-year-old mystery.
The LADEE mission – whose launch we covered back in September – was designed at NASA Ames in Mountain View to explain the mysterious colorful streaks that astronaut Eugene Cernan spotted from the window of Apollo 17 in 1972.
(You can read more about that, and see Cernan’s sketches of those mysterious “streamers,” here. And while you’re at it, take a look at some of the moon pictures LADEE sent back from its travels.)
LADEE (that’s LAD-ee, not “lady”) stands for Lunar Atmosphere and Dust Environment Explorer.
Launched on September 6 from the NASA Goddard Space Flight Center Wallops Flight Facility in Virginia, the spacecraft spent 100 days orbiting the moon, taking sips of lunar atmosphere.
“A dust veil enshrouds the moon perpetually.”
Those sips, NASA reported today, contained traces of magnesium, aluminum, neon, titanium – particles that are kicked up every time a meteorite slips through the moon’s thin atmosphere and crashes onto the surface.
“Every time a meteorite comes to the surface of the moon, it creates this ejecta-cloud,” explains NASA Ames space scientist Rick Elphic. “These particles are sent up from the surface, as if by an explosion.”
This dust “veil” Elphic explained, “enshrouds the moon perpetually.”
Thankfully, here on Earth, our robust atmosphere protects us from that fate. The LADEE findings hint at the conditions on other planets with thin atmospheres, like Mercury or the planet-formerly-known-as-Pluto.
That little sliver is the LADEE spacecraft, designed in Mountain View and photographed by another NASA mission, the Lunar Reconnaissance Orbiter. (NASA/ Goddard/Arizona State University)
LADEE’s observations also provided reassurance that future human missions to the moon’s surface will face no hazard from the dust.
“What we’ve seen means clear sailing for any future missions around there,” said Elphic.
The findings mean “clear sailing” for future human missions to the moon.
On April 14th, LADEE will fly through a lunar eclipse. That experience could freeze the instruments.
Or LADEE could keep on collecting scientific data all the way until April 21st or thereabouts, when the spacecraft is expected to collide with the moon at over 3,500 miles per hour.
That’s fast enough, say scientists, to instantly “vaporize” the $280 million spacecraft.