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Dr. Robert Zubrin, president of the Mars Society in the USA, has written several books on space science. One of these is entitled The Case for Mars on the exploration of this planet and soon another book will be published with the title The Case for Space.
What exactly does the phrase "The case for" mean?
"Case" here means "arguments, facts, and reasons in support of or against something". The case for [exploring] Mars consists of arguments, facts, reasons, etc in support of that activity.
die Argumente für/gegen might be an equivalent in German, although that is off-topic.
