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Breaking free of Earth’s gravity requires so much thrust that fuel accounts for almost 90 percent of the weight in today’s rockets

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published Mar 11, 2018, 4:00:11 PM, by Pavel Alpeyev (Bloomberg) — Google called off its race to the moon weeks ago, when it became clear no private explorer would complete the trip by the March 31 deadline. That won’t stop at least three teams from Israel, Japan and the U.S.,

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