Luna 2 2" itself. Once "Luna 2" was split from its upper stage it started transmitting information back to Earth using three different transmitters. These transmitters provided precise information on its course, allowing scientists to calculate that "Luna 2" would hit its mark on the Moon around 00:05 on September 14 (Moscow Time). In order to be able to provide a visual from Earth on September 13, the spacecraft released a vapor cloud that would expand to diameter that would be seen by observatories in Alma Ata, Byurakan, Abastumani, Tbilisi, and Stalinabad. This vapor cloud also acted as an experiment to see
Luna 2 time of impact, and the transmission and trajectory details. Even though Soviet scientists gave all this information, the Americans were still skeptical until Bernard Lovell was able to prove that the radio signal was coming from "Luna 2" by showing the Doppler shift from its transmissions. After this no one seemed to question the veracity of the Soviets. "Luna 2" showed time variations in the electron flux and energy spectrum in the Van Allen radiation belt. The spacecraft also carried Soviet pennants. Two of them, located in the spacecraft, were sphere-shaped, with the surface covered by identical pentagonal elements. In