Editing Space exploration (section)

===First object in orbit===
The first successful orbital launch was of the [[Soviet Union|Soviet]] uncrewed ''[[Sputnik 1]]'' ("Satellite 1") mission on 4 October 1957. The satellite weighed about {{convert|83|kg|lb|abbr=on}}, and is believed to have orbited Earth at a height of about {{convert|250|km|mi|abbr=on}}. It had two radio transmitters (20 and 40&nbsp;MHz), which emitted "beeps" that could be heard by radios around the globe. Analysis of the radio signals was used to gather information about the electron density of the ionosphere, while temperature and pressure data was encoded in the duration of radio beeps. The results indicated that the satellite was not punctured by a [[meteoroid]]. ''Sputnik 1'' was launched by an [[R-7 Semyorka|R-7]] rocket. It burned up upon re-entry on 3 January 1958.