Japan will attempt to land a spacecraft on the moon precisely
Briefly

"The goal of this mission is to land where you want to land, instead of landing where you can land," said Hiroyuki Kamata, a professor at Meiji University in Tokyo who helped develop the vision-based navigation system for SLIM.
"The biggest challenge is the fact that we only have one shot," said Shinichiro Sakai, the SLIM project manager. "The final test will be during the last 20 minutes of landing. What we have spent 20 years developing will be tested out in just 20 minutes. We must accomplish this."
Read at Washington Post
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