OpenRocket text:

Create logo using Gimp's "Blended" logo script.
Apply suitable gradient to text layer
(softened "Horizon 1" -> "Horizon 1 soft").
Font: Kanit (Italic): https://fonts.google.com/specimen/Kanit?query=kanit


Background starfield:

Credits:  NASA/JPL/MPS/DLR/IDA
(http://photojournal.jpl.nasa.gov/catalog/PIA12066)
Figure 2 with texts removed, scaled down.