div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: Use of Artificial Satellites to Explore the Earths Gravitational Field: Results from Sputnik 2 1957β src=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© 1958 Nature Publishing Grouppdivdiv class=trans-pagebuttonPage 2button div class=trans-image a href=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5page2jpg target=_blank amp-img class=trans-thumb alt=Page 2: Use of Artificial Satellites to Explore the Earths Gravitational Field: Results from Sputnik 2 1957β src=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© 1958 Nature Publishing Grouppdiv