SpaceX Dragon spreads its wings toward the ISS

SpaceX launched their Falcon 9 rocket from Space Launch Complex 40 (SLC-40) carrying the Dragon spacecraft toward the ISS. This is the first launch from SLC-40 since the Amos-6 pad anomaly back in September of 2016. This is also the first time NASA has agreed to use a flight-proven first stage on a resupply mission under the CRS contract. 

The Falcon 9 lifted off from SLC-40 at 10:36am EST and ascended into the skies of Cape Canaveral, Florida carrying loads of science to the International Space Station. There are 2 major payloads in

Photo of Dragon separation from the second stage
Photo credit // SpaceX

the unpressurized portion of Dragon which will be extracted by the robotic arm on the ISS a little after arrival. One of the payloads is a Total and Spectral Solar Irradiance Sensor (TSIS-1) that will measure the suns solar energy flow to the Earth and how it affects the atmosphere. The second payload is a space debris sensor that'll be used to analyze the small particles that the ISS collides with. Inside the pressurized portion of Dragon, there are various experiments that will be conducted inside of the ISS by the crew. There are also technological demonstrators for cell science research and fluid experiments as well as materials for micro-g fiber optic cable construction. Secondly, there are rodents being sent up for other research on how they react to different environments on the space station. Lastly, barley is being sent to the ISS and will be the first step to an on-board brewery.

Falcon 9 lifts off of SLC-40
Photo credit // SpaceX

SLC-40 has also been upgraded in various ways to support more launches and added redundancies for familiarity between launch pads for employees. They have made new doghouses (shields for the hold down clamps) to help protect the clamps during launch to last longer. The flame trench has been redesigned to withstand more power which allow for longer static fires of the Falcon 9. LOX Systems have been upgraded to make the densification of liquid oxygen a lot faster and the loading of it into the launch vehicle quicker. After the strongback was destroyed when Falcon exploded on the pad, they have manufactured a new one which has stronger lift cylinders to allow a one-step process to raise the vehicle vertically faster. Now that SLC-40 is active once again, SpaceX has 3 operational launch pads which will allow for a faster cadence of launches.

The Dragon spacecraft used on this mission has been refurbished after being flown for CRS-6 back in 2015. In order for Dragons to be reused, they need to go under several analysis, inspections, and

The Falcon 9 first stage lands at LZ-1
Photo credit // SpaceX

tests in McGregor, Texas and Hawthorne, California. The first stage was also reused and did not have the soot washed off of it, which they plan to do for other reused boosters as well (unless it's beneficial to wash it).