· rockets
· Rovers (US exploration of Mars)
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radiorabbitring (jewelry)roperosesrugs
a space word for R could be Rhea the moon of saturn.
telescope (Hubble)
Earth!
Words that start with R and end with R:racerradarradiatorrafterrancherrancorratherrazorreaderreaperreappearrearreceiverrecorderrecoverregisterregularregulatorreindeerrelieverremainderrememberreminderremoverrenterreoccurrepairreporterresistorresponderretailerretainerretrieverrevolverriderrigorringerriserriverroarrobberrockerrollerrooferroosterrosterrubberrulerrumorrunner