The Moon

FILE - In this file photo dated August 26, 1978, Soviet cosmonaut Valery Bykovsky, left, poses with first German astronaut from East Germany Sigmund Jaehn, at the Cosmodrome in Baikonur, prior to their space trip aboard Soviet rocket Soyuz 31 to the Salyut 6 space station. Russia's space agency said Wednesday March 27, 2019, that pioneering Soviet-era cosmonaut Valery Bykovsky, who made the first of his three flights to space in 1963, has died at age 84. (AP Photo/FILE)

A SpaceX Falcon 9 rocket lifts off with Israel's Lunar Lander and an Indonesian communications satellite at space launch complex 40, Thursday, Feb. 21, 2019, in Cape Canaveral, Fla. An Israeli spacecraft blasted off to the moon in an attempt to make the country’s first lunar landing, following a launch Thursday night by SpaceX. (AP Photo/Terry Renna)

File - In this Monday, Dec. 17, 2018 file photo, technicians stand next to the SpaceIL lunar module, an unmanned spacecraft, is on display in a special "clean room" where the space craft is being developed, during a press tour of their facility near Tel Aviv, Israel. SpaceIL and state-owned Israel Aerospace Industries told a news conference that the landing craft will take off from Florida, to its weekslong voyage to the moon this week. (AP Photo/Ariel Schalit, File)

In this photo released by Xinhua News Agency, the screen at the Beijing Aerospace Control Center shows the lander of the Chang'e-4 probe, right, and the rover Yutu-2 (Jade Rabbit-2) taking photos of each other, Friday, Jan. 11, 2019. (Jin Liwang/Xinhua via AP)

This undated photo provided by NASA shows SOFIA over the snow-covered Sierra Nevada mountains with its telescope door open during a test flight. The world's largest airborne observatory was supposed to be parked in Seattle this week, so thousands of scientists attending the "Super Bowl of Astronomy" could behold this marvel: a Boeing 747, like this one shown, for example, outfitted with a massive telescope used to study the fundamental mysteries of the universe. (Jim Ross/NASA via AP)

In this photo provided on Jan. 4, 2019, by China National Space Administration via Xinhua News Agency, Yutu-2, China's lunar rover, leaves wheel marks after leaving the lander that touched down on the surface of the far side of the moon. China’s space agency says that all systems are go for its spacecraft and rover that have made a pioneering landing on the far side of the moon. (China National Space Administration/Xinhua News Agency via AP)

In this photo provided on Thursday, Jan. 3, 2019, by China National Space Administration via Xinhua News Agency, Yutu-2, China's lunar rover, leaves wheel marks after leaving the lander that touched down on the surface of the far side of the moon. A Chinese spacecraft on Thursday, Jan. 3, made the first-ever landing on the far side of the moon, state media said. The lunar explorer Chang'e 4 touched down at 10:26 a.m., China Central Television said in a brief announcement at the top of its noon news broadcast. (China National Space Administration/Xinhua News Agency via AP)