Name of Iran their country "Arya", "Iran", "Iranshahr", "Iranzamin" (Land of Iran), "Aryānām" (the equivalent of "Iran" in the proto-Iranian language) or its equivalents. The term "Arya" has been used by the Iranian people, as well as by the rulers and emperors of Iran, from the time of the Avesta. Evidently from the time of the Sassanids (226–651 CE) Iranians have called it "Iran", meaning "the land of Aryans" and "Iranshahr". In Middle Persian sources, the name "Arya" and "Iran" is used for the pre-Sassanid Iranian empires as well as the Sassanid empire. As an example, the use of the name "Iran" for
Laser propulsion the approach, a second wavelength is used to ablate the exterior of the propellant packets on the near side. Ablative laser propulsion (ALP) is a form of beam-powered propulsion in which an external pulsed laser is used to burn off a plasma plume from a solid metal propellant, thus producing thrust. The measured specific impulse of small ALP setups is very high at about 5000 s (49 kN·s/kg), and unlike the lightcraft developed by Leik Myrabo which uses air as the propellant, ALP can be used in space. Material is directly removed from a solid or liquid surface at high