SpaceX likely to expend its last rocket for a while on Friday

Ars Technica ---------- When SpaceX launches its 15th resupply mission to the International Space Station, possibly as early as Friday morning at 5:42am ET (09:42 UTC), the company plans to fly the Block 4 version of its Falcon 9 rocket for the final time.The company's next two launches in July were already known to be flying on the latest and presumably final revision to the Falcon 9 rocket—the Block 5 variant. But during a news conference Thursday, the company's manager for the Dragon spacecraft program, Jessica Jensen, confirmed that there will be no more Block 4 flights after the impending space station launch. To learn more click on the picture below to read the article.