The Soyuz-FG rocket booster with Soyuz MS-04 spacecraft carrying a new crew to the International Space Station, ISS, blasts off at the Russian leased Baikonur cosmodrome, Kazakhstan, Thursday, April 20, 2017. The Russian rocket carries U.S. astronaut Jack Fischer and Russian cosmonaut Fyodor Yurchikhin. (Photo by Dmitri Lovetsky/AP Photo)





In this June 16, 2012, file photo, the Shenzhou 9 spacecraft rocket launches from the Jiuquan Satellite Launch Center in Jiuquan, China. State media say China is developing an advanced new spaceship capable of both flying in low-Earth orbit and landing on the moon. The newspaper Science and Technology Daily cited spaceship engineer Zhang Bainian as saying the new craft would be recoverable and have room for multiple astronauts. (Photo by Ng Han Guan/AP Photo)





In this photo released by Xinhua News Agency, a Long March 7 rocket carrying the Tianzhou 1 cargo spacecraft blasts off from the Wenchang Space Launch Center in Wenchang in southern China's Hainan Province, Thursday, April 20, 2017. China has launched its first unmanned cargo spacecraft Thursday on a mission to dock with the country's space station. (Photo by Yang Guanyu/Xinhua via AP Photo)





The space shuttle Atlantis lifts off from launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida May 14, 2010. (Photo by Pierre Ducharme/Reuters)





A SpaceX Falcon 9 rocket first stage returns to land at the Cape Canaveral Air Force Station in Cape Canaveral, Florida, U.S., February 19, 2017. (Photo by Mike Brown/Reuters)





A Russian Soyuz booster rocket, carrying the Progress cargo space craft, blasts off for the International Space Station from the Baikonur cosmodrome, Kazakhstan, February 22, 2017. (Photo by Sergei Sergeev/Reuters/Russian State Space Corporation ROSCOSMOS)





A SpaceX Falcon 9 rocket lifts off on a supply mission to the International Space Station from historic launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida, U.S., February 19, 2017. (Photo by Joe Skipper/Reuters)





A handout image dated 16 July 1969 and made available by NASA on 16 July 2014 showing the huge, 363-feet tall Saturn V rocket launching on the Apollo 11 mission from Pad A, Launch Complex 39, Kennedy Space Center, at 9:32 a.m. EDT. Onboard the Apollo 11 spacecraft were astronauts Neil A. Armstrong, commander; Michael Collins, command module pilot; and Edwin E. Aldrin Jr., lunar module pilot. Apollo 11 was the United States' first lunar landing mission. While astronauts Armstrong and Aldrin descended in the Lunar Module “Eagle” to explore the Sea of Tranquility region of the moon, astronaut Collins remained with the Command and Service Modules “Columbia” in lunar orbit. (Photo by EPA/NASA)





Russia's Soyuz MS-04 spacecraft carrying Russian cosmonaut Fyodor Yurchikhin and NASA astronaut Jack David Fischer, members of the main crew of the 51/52 expedition to the International Space Station (ISS), blasts off to the ISS from the launch pad at the Russian-leased Baikonur cosmodrome on April 20, 2017. (Photo by Kirill Kudryavtsev/AFP Photo)





A H-IIA rocket, carrying a government's information gathering radar satellite, lifts off from the launching pad at Tanegashima Space Center on the Japanese southwestern island of Tanegashima, Japan, in this photo taken by Kyodo March 17, 2017. (Photo by Reuters/Kyodo News)





The Apollo 13 (Spacecraft 109/Lunar Module 7/Saturn 508) space vehicle is launched from Pad A, Launch Complex 39, Kennedy Space Center (KSC), at 2:13 p.m. (EST), April 11, 1970. The crew of the National Aeronautics and Space Administration's (NASA) third lunar landing mission is astronauts James A. Lovell Jr., commander; John L. Swigert Jr., command module pilot; and Fred W. Haise Jr., lunar module pilot. (Photo by NASA)





This Monday, December 21, 2015 file photograph provided by the Israeli Ministry of Defense shows a launch of David's Sling missile defense system. A senior Israeli air force official says a joint U.S.-Israeli missile interceptor will be operational soon, completing the country's multi-layer defense system. He said Monday that David's Sling, meant to counter medium-range missiles possessed by Iranian-backed Hezbollah militants in Lebanon, will be operational in early April. (Photo by Ministry of Defense via AP Photo)





This photo provided by United Launch Alliance shows an Atlas V rocket carrying the NROL-79 mission at the Space Launch Complex-3, Vandenberg Air Force Base, Calif., on Wednesday, March 1, 2017. rocket carrying a classified U.S. satellite dubbed NROL-79 is described only as a national security payload for the National Reconnaissance Office. (Photo by United Launch Alliance via AP Photo)





This photo provided by United Launch Alliance shows an Atlas V rocket carrying the NROL-79 mission at the Space Launch Complex-3, Vandenberg Air Force Base, Calif., on Wednesday, March 1, 2017 in preparation for the launch. (Photo by United Launch Alliance via AP Photo)





In this photo taken with long time exposure, the Soyuz-FG rocket booster with Soyuz MS-04 space ship carrying a new crew to the International Space Station, ISS, blasts off at the Russian leased Baikonur cosmodrome, Kazakhstan, Thursday, April 20, 2017. The Russian rocket carries two astronauts, U.S. astronaut Jack Fischer and Russian cosmonaut Fyodor Yurchikhin. (Photo by Dmitri Lovetsky/AP Photo)