<!-- FAIR USE of Protonstation.jpg: see image description page at http://en.wikipedia.org/wiki/Image:Protonstation.jpg for rationale -->The Proton was a model of Soviet scientific artificial satellites. The maximum mass was about 17 tonnes. Four "Protons" were launched between 1965 and 1968. The satellite was developed by NPO Mashinostroyenia. The aim of the project was to study high and ultra-high energy particle.
The latest became Proton 4 (NORAD ID: 3544, NSSDC ID: 1968-103A) launched on November 16, 1968 by Proton-K rocket with a booster and was in orbit for 250 days. at NASA NSSDC Master Catalog
The Proton satellites were the source of the name for the Proton rocket, which launched them as some of its first payloads.
<gallery>Image:Proton satellite model.jpg|Proton satellite model at Tsiolkovsky State Museum, two solar panel dismantled to fit the hallImage:Proton satellite model closeup.jpg|Proton satellite model (closeup)</gallery>