Read the text. Fill in the gap with the missing part of the sentence.
One part is extra.
The search is based on the theory that the comets which have been hitting the Moon over the last 2 billion years have left ice in its craters. _____________

• If this is the case, astronauts can use solar energy to melt the ice into water.
• Just think, 400,000 dollars is needed to send an object that weighs around four kilos to the Moon.
• All the same, we have not found any evidence that the Moon has water.
• Perhaps the human race may be able to live on Mars in the future!
• Yet, we must face the fact that before this can happen we have a few problems to deal with.
• With this information they will be able to finally know if there is water on the Moon.
• Moreover, the poles see much more sunlight, which can be used for solar energy.