A SpaceX Falcon 9 rocket lifts off at the Cape Canaveral Air Force Station in Cape Canaveral, Florida, in this December 21, 2015 file photo. A SpaceX Falcon rocket thrust a communications satellite into orbit March 4, 2016, before the reusable main-stage booster turned around, soared back toward Earth and was destroyed when it failed to land its self on a platform in the ocean, according to the company. (Photo by Joe Skipper/Reuters)





Astronauts Richard J. Hieb, Thomas D. Akers and Pierre J. Thuot (L-R) attach a specially designed grapple bar underneath the 4.5 ton Intelsat VI satellite at the space shuttle Endeavour's cargo bay in this NASA handout photo taken May 13, 1992. (Photo by Reuters/NASA)





A handout picture made available by NASA on 20 August 2016 shows International Space Station (ISS) Expedition 48 crew members Kate Rubins (L) and Jeff Williams (R) preparing to grapple the SpaceX Dragon supply spacecraft from aboard the ISS, in space, 20 July 2016. Rubins and Williams successfully conducted a spacewalk on 19 August 2016 to install the first of two international docking adapters (IDAs). The new docking port will enable the future arrival of US commercial crew spacecraft. (Photo by EPA/NASA)





Astronaut Jeffrey Hoffman during Shuttle Mission STS-61. One of the tasks on this servicing flight was to replace the Wide Field and Planetary Camera (WF/ PC) with a new version. The new camera has improved detectors as well as a new optics system to allow for the fault in the HST' s main mirror. Five spacewalk shifts were performed to conduct all of the servicing tasks required. Mission STS-61 flew on 2-13 December 1993. (Photo by NASA/Science Photo Library)





SpaceX Falcon 9 rocket attached to the cargo-only capsule called Dragon lifts off from the launch pad on October 7, 2012 in Cape Canaveral, Florida. The rocket is bringing cargo to the International Space Station that consists of clothing, equipment and science experiments. (Photo by Joe Raedle/Getty Images)





Falcon 9 attempts to land on a floating platform in the Atlantic Ocean on April 14, 2015. (Photo by Ben Cooper/SpaceX)





In this handout provided by the National Aeronautics and Space Administration (NASA), SpaceX's Falcon 9 is moved to the launch pad prior to the rocket's Thales Alenia Space launch attempt on April 26, 2015 in Cape Canaveral, Florida. (Photo by NASA via Getty Images)





The unmanned Falcon 9 rocket launched by SpaceX, on a cargo resupply service mission to the International Space Station, lifts off from the Cape Canaveral Air Force Station in Cape Canaveral, Florida January 10, 2015. The unmanned Space Exploration Technologies Falcon 9 rocket blasted off from Florida on Saturday carrying a cargo capsule for the International Space Station, then turned around to attempt an unprecedented landing on earth.While the cargo ship flies towards the space station, the rocket was expected to head back to a floating platform in the Atlantic Ocean some 200 miles (322 km) off Jacksonville, Fla., north of the Cape Canaveral Air Force Station launch site. (Photo by Scott Audette/Reuters)





This photo provided by NASA is one of an extensive series of still photos documenting the arrival and ultimate capture and berthing of the SpaceX Dragon capsule at the International Space Station, as photographed by the Expedition 39 crew members onboard the orbital outpost Sunday April 20, 2014. (Photo by AP Photo/NASA)





Photographers record the launch of the Falcon 9 SpaceX from Space Launch Complex 40 at the Cape Canaveral Air Force Station in Cape Canaveral, Fla., Saturday, January 10, 2015. SpaceX is on a resupply mission to the International Space Station. (Photo by John Raoux/AP Photo)





In this Friday, April 17, 2015 file photo, the Canadarm 2 reaches out to capture the SpaceX Dragon cargo spacecraft for docking to the International Space Station. Americans haven't rocketed into orbit from their home turf since NASA's last shuttle flight in 2011. SpaceX and Boeing expect to resume human launches from Cape Canaveral in another year or two. (Photo by AP Photo/NASA)





Crowds pack Space View Park in Titusville, Fla., as a SpaceX Falcon 9 rocket carrying a 11,600 pound SES-9 communications satellite lights up the sky during launch from the Cape Canaveral Air Force Station launch complex 40 Friday, March 4, 2016. (Photo by Craig Rubadoux/Florida Today via AP Photo)





A picture made available on 14 November 2016 shows the Soyuz MS-03 spacecraft transported to the launch pad at the Russian-leased Baikonur cosmodrome in Kazakhstan, 13 November 2016. New International Space Station (ISS) crew members US astronaut Peggy Annette Whitson of NASA, French astronaut Thomas Pesquet of European Space Agency (ESA) and Russian cosmonaut Oleg Novickiy of the Russian space agency Roscosmos are set to take off from Kazakhstan's Baikonur cosmodrome to the International Space Station on 17 November. (Photo by Yuri Kochetkov/EPA)





A handout photo made available by NASA's Johnson Space Center shows NASA astronaut Peggy Whitson (C) posing with Expedition 50 Commander Shane Kimbrough of NASA (L) and Flight Engineer Thomas Pesquet of ESA (European Space Agency, R) prior to their spacewalk, in space, 24 March 2017 (issued 24 April 2017). The pair conducted a six hour and 34 minute spacewalk on 24 March 2017. According to NASA, Whitson will officially set on 24 April 2017, the US record for most cumulative days in space aboard the International Space Station (ISS), surpassing the 534 days record of astronaut Jeff Williams. US President Donald Trump, his daughter Ivanka Trump, and NASA astronaut Kate Rubins will make a special Earth-to-space call on 24 April 2017, to congratulate Whitson for her record-breaking. (Photo by EPA/NASA)





United States astronaut Jack Fischer tweeted this image from the International Space Station (ISS) on May 24, 2017 writing “Changed a window cover today – it's like having a new windshield, only your car is a space station going 17,500 mph. I love my new windshield”. (Photo by Jack Fischer/NASA)





NASA astronaut Peggy Whitson is seen during the 200th spacewalk in support of the International Space Station on May 12, 2017. Expedition 51 Commander Peggy Whitson and Flight Engineer Jac, k Fischer of NASA successfully replaced a large avionics box that supplies electricity and data connections to the science experiments. The astronauts also completed additional tasks to install a connector that will route data to the Alpha Magnetic Spectrometer, repair insulation at the connecting point of the Japanese robotic arm, and install a protective shield on the Pressurized Mating Adapter-3. This adapter will host a new international docking port for the arrival of commercial crew spacecraft. (Photo by NASA)





Pesquet looks out from the cupola of the space station in an image tweeted on May 20, 2017. “The day of return is approaching: I can't wait to be on Earth again and see my loved ones... but I will certainly miss the view”, he wrote. Pesquet is currently on a six-month mission aboard the station. He previously worked as an aerospace engineer and is also a pilot for Air France. (Photo by ESA/NASA)