Volume: 07, Issue: 03 03/11/2009 
A United Launch Alliance Delta II rocket carrying the NASA Kepler spacecraft blasts off from Space Launch Complex-17B at Cape Canaveral Air Force Station. Photo by Carleton Bailie, United Launch Alliance.
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Artist concept of Kepler in space. Image credit: NASA/JPL.
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An image showing the Milky Way region of the sky where the Kepler spacecraft/photometer will be pointing. Image credit: Carter Roberts / Eastbay Astronomical Society.
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Other Articles in This Issue:
Newfound Moon May Be Source of Outer Saturn Ring
NASA's Launch Of Carbon-Seeking Satellite Unsuccessful
Station Spacewalkers Install Experiments, Probe
Discuss Spaceflight with Former NASA Astronaut Rich Clifford

NASA's Kepler Mission Rockets to Space in Search of Other Earths

NASA’s Kepler mission successfully launched into space from Cape Canaveral Air Force Station, Florida, aboard a United Launch Alliance Delta II at 10:49 pm Eastern time on March 6, 2009. Kepler is designed to find the first Earth-size planets orbiting stars at distances where water could pool on the planet’s surface. Liquid water is believed to be essential for the formation of life.

“It was a stunning launch,” said Kepler Project Manager Hames Fanson of NASA’s Jet Propulsion Laboratory in Pasadena, California. “Our team is thrilled to be a part of something so meaningful to the human race – Kepler will help us understand if our Earth is unique or if others like it are out there.”

Engineers acquired a signal from Kepler at 12:11 am on March 7, after it separated from its spent third-stage rocket and entered its final sun-centered orbit, trailing about 1,529 kilometers behind Earth. The spacecraft is generating its own power from its solar panels.

“Kepler now has the perfect place to watch more than 100,000 stars for signs of planets,” said William Borucki, the mission’s science principal investigator at NASA’s Ames Research Center at Moffett Field, California. Borucki has worked on the mission for 17 years. “Everyone is very excited as our dream becomes a reality. We are on the verge of learning if other Earths are ubiquitous in the galaxy.”

Engineers have begun checking Kepler to ensure it is working properly, a process called “commissioning” that will take about 60 days. In about a month or less, NASA will send commands for Kepler to eject its dust cover and make its first measurements. After another month of calibrating Kepler’s single instrument, a wide-field charge-couple device camera, the telescope will begin to search for planets.

The first planets to roll out on the Kepler “assembly line” are expected to be the portly “hot Jupiters” – gas giants that circle close and fast around their stars. NASA’s Hubble and Spitzer space telescopes will be able to follow up with these planets and learn more about their atmospheres. Neptune-sized planets will most likely be found next, followed by rocky ones as small as Earth. The true Earth analogs – Earth-sized planets orbiting stars like our sun at distances where surface water, and possibly life, could exist – would take at least three years to discover and confirm. Ground-based telescopes also will contribute to the mission by verifying some of the finds.

In the end, Kepler will give us our first look at the frequency of Earth-size planets in our Milky Way galaxy, as well as the frequency of Earth-size planets that could theoretically be habitable.

“Even if we find no planets like Earth, that by itself would be profound. It would indicate that we are probably alone in the galaxy,” said Borucki.

As the mission progresses, Kepler will drift farther and farther behind Earth in its orbit around the sun. NASA’s Spitzer space telescope, which was launched into the same orbit more than five years ago, is now more than about 100 million kilometers (62 million miles) behind Earth.

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