Explorer 32
... that the Explorer 32 satellite was able to determine the density of the upper atmosphere through ground-based observations of the effect of drag on the satellite?
... that the <b id="mwBNE"><a href="./Explorer_32" id="mwBNI" rel="mw:WikiLink" title="Explorer 32">Explorer 32</a></b> satellite was able to determine the <a href="./Density" id="mwBNM" rel="mw:WikiLink" title="Density">density</a> of the <a class="mw-redirect" href="./Earth's_atmosphere" id="mwBNQ" rel="mw:WikiLink" title="Earth's atmosphere">upper atmosphere</a> through ground-based observations of the effect of <a href="./Drag_(physics)" id="mwBNU" rel="mw:WikiLink" title="Drag (physics)">drag</a> on the satellite?