<a href="https://en.wikipedia.org/wiki/Explorer_1" id="mwASE" rel="mw:WikiLink" title="Explorer 1">Explorer 1</a> re-enters the <a href="https://en.wikipedia.org/wiki/Atmosphere_of_Earth" id="mwASI" rel="mw:WikiLink" title="Atmosphere of Earth">Earth's atmosphere</a> after 12 years in orbit.