alpha-particle detector
41Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… …
42Proton — For other uses, see Proton (disambiguation). This article is about the proton as a subatomic particle. For the aqueous form of the hydrogen ion often encountered in biochemistry, see Hydronium. Proton The quark structure of the proton. (The color …
43Surveyor 5 — Infobox Spacecraft Name=Surveyor 5 Caption=Surveyor model on Earth Organization=NASA Major Contractors=Hughes Aircraft Mission Type= Lunar Science Satellite of= Moon Launch= September 8, 1967 at 07:57:00 UTC Launch Vehicle= Atlas Centaur Decay=… …
44Surveyor 6 — Infobox Spacecraft Name= Surveyor 6 Caption=Surveyor model on Earth Organization=NASA Major Contractors= Hughes Aircraft Mission Type= Lander Satellite of= Moon Launch= November 7, 1967 at 07:39:00 UTC Launch Vehicle= Atlas Centaur Decay= Landed… …
45Neutron — This article is about the subatomic particle. For other uses, see Neutron (disambiguation). Neutron The quark structure of the neutron. (The color assignment of individual quarks is not important, only that all three colors are present.)… …
46star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …
47Surveyor 7 — Infobox Spacecraft Name=Surveyor 7 Caption=Surveyor model on Earth Organization=NASA Major Contractors= Hughes Aircraft Mission Type=Lander Satellite of= Moon Launch= January 7, 1968 at 06:30:00 UTC Launch Vehicle= Atlas Centaur Decay=Landed on… …
48Depleted uranium — The DU penetrator of a 30 mm round[1] Depleted uranium (DU; also referred to in the past as Q metal, depletalloy, or D 38) is uranium with a lower content of the fissile isotope U 235 than natural uranium (natural uranium is about 99.27% uranium… …
49Electron — For other uses, see Electron (disambiguation). Electron Experiments with a Crookes tube first demonstrated the particle nature of electrons. In this illustration, the profile of the cross shaped target is projected against the tube face at right… …
50Mariner 4 — Operator NASA Mission type Flyby Flyby of Mars …
