But of course, the primary mission is not to land the rocket but to get almost 6,000 pounds of supplies and science experiments to the ISS.
Also, SpaceX will attempt to recover the first stage of Falcon 9 at its LZ-1 at Cape Canaveral Air Force Base.
On October 25, 2014, the Dragon spacecraft returned to Earth splashing down in the Pacific Ocean. If the SpaceX supply ship arrived Sunday, as originally intended, the astronauts aboard the space station would have been too busy unpacking cargo and conducting experiments delivered by the Dragon to manually release the Cygnus, which is bolted to a different berthing port than the one Dragon will use.
Once it reaches the station, an arm on the station will extend and astronauts Peggy Whitson and Jack Fischer will control the arm to grapple the Dragon capsule.
Instead of just discarding expensive spacecraft and rockets, companies like SpaceX and Blue Origin are planning to reuse spacecraft and rocket stages for multiple missions.
The lightning did not hit any of SpaceX's equipment but happened within 10 miles (16 kilometers) of the launch pad.
Apple Spotlights Siri in Swipe at Rival Amazon's Alexa
With the Alexa App, Amazon's Echo speakers allow you to communicate, google search, play music, etc. with the speaker robot. Apple also released a software kit so developers could infuse augmented reality into applications for iPhones or iPads.
In short, today is a big deal, and it will be pretty damn cool to watch SpaceX make history again. For the first time, much of its Dragon spacecraft will be reused from previous missions, part of the company's cost-cutting efforts.
SpaceX designs, manufactures, and launches the world's most advanced rockets and spacecraft. Last year, SpaceX launched a total of eight missions before a launch-pad explosion that destroyed a rocket and commercial satellite, grounding the company for several months.
The instantaneous window will open at 5:55 p.m, with a back up time set for Saturday at 5:07 p.m.
SpaceX will also feature their own live webcast beginning approximately 20 minutes before launch at 5:35 p.m. EDT.
SpaceX leases LC-39A at Kennedy Space Center from NASA.
On the weather front, conditions were 70 percent "go" as of Wednesday morning, according to the Air Force's 45th Weather Squadron, with the forecast dropping to 60 percent "go" for a backup 5:07 p.m. launch on Saturday.