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Scientists have discovered water on the sunlit surface of the moon for the first time but does it matter? The moon is back in vogue in terms of space exploration - the US says it will put astronauts back on the lunar surface by 2024. Its supposed to be the precursor to a manned mission to Mars. Stephen Sackur speaks to Jacob Bleacher, Chief Exploration Scientist at NASA. In this time of pandemic and climate change here on earth is space exploration a potential lifeline or a massive vanity project?