Astronomy and Space

Explorer 20

Explorer 20, also known Ionosphere Explorer-A, IE-A, S-48, TOPSI and Topside Explorer, was a NASA satellite launched as part of Explorer program. Its purpose was two-fold: long-term investigation of the ionosphere from above, and in situ investigation of ion concentrations and temperatures.

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See also

• ▸Beta Centauri
• ▸Economic history of pre-unitarian Italy
• ▸Integrate-Transfer-Launch Complex

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