Returning to the moon is an important step for our space program.

CNN: Bush: 'It is time for America to take the next steps' in space

The moon is a logical step toward further progress and achievement.

CNN: Bush: 'It is time for America to take the next steps' in space

The next astronauts to step out onto the dusty gray surface of the moon will be wearing a suit that's very different from the bulky white armor worn by the Apollo explorers.

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But Anderson said the next big step involves something slightly further afield - a trip to the Moon.

CNN: Opening the space frontier, one tourist at a time

It's a tremendous step, the first of many as we get into exploration of the Solar System, back to the Moon and on to Mars.

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Once the two GRAIL satellites are in orbit, their next step is to begin a five week phase in which they increase the speed at which they orbit the Moon.

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Speaking earlier at the summit, UN Secretary General Ban Ki-moon said he believed an agreement was in sight, with recent moves by some countries a positive step to cutting emissions.

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