BREAKING: SpaceX calls off launch of rocket to International Space Station

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Countdown for unmanned Falcon rocket was halted with one minute remaining, NASA tweeted Tuesday morning. No reason was given for the cancellation. The next possible launch date is Friday, NASA said. The Dragon capsule aboard the rocket contains supplies for the space station. SpaceX also is trying something never attempted before: landing the spent rocket booster on a platform in the Atlantic Ocean. FOR THE LATEST NEWS VISIT:   USATODAY.COM