Select proper alternative and complete the following paragraph.
(NASA, ISRO, Apollo-2, Stones , manned Luna 2 , ummanned , Chandrayaan-1 , USA, Soviet Union , India)
The spacerafts in the Luna series sent by ……….. reached near the moon. `............`, launched in 1959 was first craft in this series . Till 1975, 15 spacecrafts were sent to moon, which made chemical analysis of the moon and also measured its gravity , density and radiations. Last four crafts even landed on the moon and brought the samples of `.................` from the surface of the moon for analysis in the laboratories . America also executed moon missions in the duration of 1962 to 1972 . The speciality of these missions was that some of these were `..........` missions . In July ,1969 , Neil Armstrong become the first human to step on the moon. In 2008 , `...........` launched `............` and placed it into an orbit around the moon . It obtained useful information of moon for about a year.

Explanation

The spacecrafts in the Luna series sent by Soviet Union reached reached near the moon . Luna 2 , launched in 1959 was first craft in this series . Till 1975 ,15 spacecrafts were sent to moon , which made chemical analysis of the moon and also measured its gravity , density and radiations . Last four crafts even landed on the moon and brought the samples of stones from the surface of the moon for analysis in the laboratories. America also executed moon missions in the duration of 1962 to 1972 . The speciality of these missions was that some of these were manned missions . In july , 1969, Neil Armstrong become the first human to step on the moon . In 2008 , ISRO successfully launched Chandrayaan -1 and placed useful information of moon for about a year.