Analysis of information sources in references of the Wikipedia article "Oort cloud" in English language version.
{{cite book}}
: |journal=
ignored (help)Voyager 1 is escaping the solar system at 17 kilometers per second.
{{cite book}}
: |journal=
ignored (help){{cite book}}
: |journal=
ignored (help)Voyager 1 is escaping the solar system at 17 kilometers per second.