Editing Proton (satellite program) (section)

===Proton 1===

Proton 1 was launched into Earth orbit 16 July 1965 11:16&nbsp;UTC from [[Baikonur Cosmodrome Site 81/23]],<ref name=log>{{Cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|last=McDowell|first=Jonathan|publisher=Jonathon's Space Report|access-date=30 December 2018}}</ref> though the launch was threatened by a leak in the oxidizer pipeline resulting in [[nitrogen tetroxide]] spilling on electrical wires. Early in the flight, launch specialists only received signals indicating that the satellite was functioning. Eventually, however, Proton 1 performed normally, returning physics data on ultra-high-energy cosmic particles. Its mission lasted 45 days,<ref name=astro/> and the satellite reentered Earth's atmosphere 11 October 1965.<ref name=cat>{{Cite web|url=https://www.planet4589.org/space/log/satcat.txt|title=Satellite Catalog|last=McDowell|first=Jonathan|publisher=Jonathon's Space Report|access-date=23 October 2020}}</ref>