SpaceX has now successfully landed 20 rockets [Updated]

Enlarge / This is SpaceX's 13th supply mission to the International Space Station. (credit: NASA)

11am ET Update: Friday's launch went off without a hitch, with the Falcon 9 booster sending a Dragon spacecraft into a good orbit to reach the International Space Station. Then, the first stage safely-if a bit sooty-made a near-perfect landing back on Earth. This marks the company's 20th successful landing overall, and 16th in a row.

Original post: SpaceX will attempt to send a cargo spacecraft to the International Space Station on Friday morning, with an instantaneous launch window that opens at 10:36am ET. There are some clouds at the launch site, but overall weather conditions appear favorable for a liftoff today.

Perhaps the bigger question is whether the technical problems with the launch have been solved. Originally targeted for Tuesday, SpaceX delayed a day to Wednesday for additional pre-launch ground systems checks. Then the company delayed until Friday because it had detected "particles" in the fuel system of the rocket's second stage. As a result, it needed to conduct "full inspections and cleanings."

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