Where does Earth's atmosphere end and space begin? This and other questions soon will be answered by our Ionospheric Connection Explorer, or ICON, spacecraft that will launch Oct. 10. Learn more about this @NASASun mission: https://blogs.nasa.gov/icon/2019/09/06/icon-launch-targeted-for-oct-10/?utm_source=TWITTER&utm_medium=NASA&utm_campaign=NASASocial&linkId=73406280
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