NASA to bomb Moon in search for water

Just weeks after ISRO and NASA announced discovery of evidence of water on the lunar surface, the US Space agency is all set to bomb the Moon tomorrow in search for hidden water in a controversial mission.

Scientists will see two spacecraft slamming into the moon's south pole at 9,000 kmph kicking up a 10-km-high shower of debris that National Aeronautics and Space Administration (NASA) hopes will confirm the presence of enough water necessary to supply future visits by astronauts.

Amateur astronomers in parts of the world may be able to view the impact through a telescope; for everyone else, the crash will be broadcast live on the NASA website along with early pictures of the lunar dust cloud during the dramatic mission. Within an hour of the impact, scientists will know whether water was hiding there or not.

The Indian Space Research Organisation(ISRO) announced last month that the country's first unmanned lunar mission Chandrayaan-I found evidence of water on the moon within a month after it was launched in October last year to make the first such discovery. NASA had also announced last month that it found evidence of water.

The crashing spaceship was launched in June along with an orbiter that is now mapping the lunar surface. LCROSS, short for Lunar Crater Observation and Sensing Satellite and pronounced L-Cross, is on a collision course with the moon, attached to an empty 2.2-tonne rocket that helped get the probe off the ground.

NASA is carrying out this mission to see if any water, ice or vapour is revealed in the cloud of debris. Discovering sub-surface ice is important because the ice could be used as a source of water for efforts to build a colony on the moon’s surface.

The mission itself continues to be controversial.

Questions have been raised as to whether the crash-landing on the moon was necessary for science or will it be worth the damage done to the moon. Critics say the bombing mission interferes with natural forces.

But NASA says the bombing isn’t an act of hostility and it’s all part of our search for water in space.

According to reports, the spacecraft will hit that part of the moon where scientists believe billions of tonnes of trapped ice may be held.

In the early hours of Friday(GMT) LCROSS and its empty rocket will separate. At 1131 GMT(1701) the larger empty rocket will crash into a permanently dark crater and kick up a 6.2 mile high spray of debris. Railing just behind that rocket is the LCROSS satellite itself, beaming back to Earth live pictures of the impact and the debris plume using colour cameras.

It will scour for ice, fly through the debris cloud and then just four minutes later take the fatal plunge itself, triggering a dust storm one-third the size of the first hit.
The mission is a set-the-stage venture dreamed up by the NASA office that has been working on a 75 billion dollars plan to eventually return astronauts to the moon.

The two spaceships will smash into the moon at 9,000 km per hour, more than seven times the speed of sound. The explosion will have the force of 1.5 tonnes of TNT and throw 350,000 kgs of lunar dirt out of the crater. It will create a new crater inside an old one about half the size of an Olympic swimming pool.

Why is Moon dust sticky? Physicist says he has answer

One of the biggest problems facing America's space agency as it prepares to return to the moon is how to manage lunar dust. It gets into everything. Worse, it's sticky, adhering to spacesuits and posing a potentially serious health hazard to future colonists.

Now, a scientist who has been studying the problem off and on over four decades thinks he may have untangled the mystery of why that dust is so sticky. Brian O'Brien, an Australian physicist who worked on the Apollo program in the 1960s, said the sun's ultraviolet and X-ray radiation gives a positive charge to the dust, making it stick to surfaces such as spacesuits.

This doesn't happen on Earth because our atmosphere screens out much of the sun's harmful radiation.

The moon's atmosphere is so thin that the rays easily reach the surface.

O'Brien's most important finding, at least for NASA's purposes in planning for a return to the moon by 2020, is that the angle of the sun's rays influences the stickiness. The more direct the sunlight, he said, the stickier the dust.

O'Brien's interest in lunar dust dates to 1965, when he was at Houston's Rice University, where he was selected as the lead scientist for seven lunar experiments designed for the Apollo program. He began worrying that lunar dust could clog his devices and ruin the experiments.

Lunar dust is "a bloody nuisance," O'Brien said in a statement.

In 1970, he published a paper showing that lunar dust kicked up by the Apollo 11 lunar module that carried Neil Armstrong and Buzz Aldrin back to space coated the surface of a seismometer left behind on the moon's surface. The ground motion sensor overheated and failed after three years.

More than three decades later, in 2006, O'Brien's fascination with lunar dust was rekindled when he learned that NASA had misplaced the original tapes from his dust-detecting experiments, he said in an e-mail from his home outside Perth, Australia. O'Brien dug up his own collection of 173 tapes and set about trying to understand the behavior of the dust once more.

Now 75 and retired, he traced his desire to unravel the 40-year-old problem to "old-fashioned enduring interest and, I suppose, curiosity."

Over two years of painstaking research, O'Brien tracked the dust accumulating on two solar cells, one horizontal and one vertical, over the course of two lunar days. That may not sound like much time, but a lunar day equals nearly 30 days on Earth.

He found that little dust collected on the horizontal cell in the lunar morning, when the sun's rays were slanted, while more dust adhered to the vertical cell, which more directly faced the rising sun.

The weaker the sun's rays, he found, the weaker the electrostatic forces causing the dust particles to stick, until the dust fell off.

Some scientists believe that one of the greatest challenges for future lunar colonists will be keeping their lungs free of the particles, each thinner than a human hair but sharp as a razor.

Based on his research, which is to be published in the journal Geophysical Research Letters, O'Brien thinks colonists will be able to combat the dust problem with a practical, Earth-tested solution: old-fashioned sunscreen.

There might be other approaches, O'Brien said, but "I leave that stuff to the engineers responsible for the safety of the astronauts."

NASA's Johnson Space Center in Houston, the home of the manned spaceflight program, is working on the dust problem too. Several scientists there have been in contact with O'Brien, according to the center's press office. Officials didn't challenge O'Brien's findings nor did they endorse them.

"There are several models that predict how lunar dust behaves on the moon and very little evidence to validate those models," said Josh Byerly, a public affairs officer at Johnson. "We probably will not know its true behavior until we return."