div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5page1jpg target=_blank img data-url=documentuse-of-artificial-satellites-to-explore-the-earths-gravitational-field-resultshtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: Use of Artificial Satellites to Explore the Earths Gravitational Field: Results from Sputnik 2 1957β loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5thumbnails1jpg width=140 height=200 adivp© 1958 Nature Publishing Grouppdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imagea href=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5page2jpg target=_blank img data-url=documentuse-of-artificial-satellites-to-explore-the-earths-gravitational-field-resultshtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: Use of Artificial Satellites to Explore the Earths Gravitational Field: Results from Sputnik 2 1957β loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader043fdocumentorgreader043viewer20220205225750680f1a28ab0f07ae69d5html5thumbnails2jpg width=140 height=200 adivp© 1958 Nature Publishing Grouppdiv