Here is a list of a few words I was able to come up with!
Interstellar
Ionosphere
Infrared
Impact
Inclination
International Space Station (ISS)
Interplanetary
Interstellar medium
Intergalactic
In situ
Ingress
Interferometry
Inversion
Iapetus (a moon of Saturn)
Imaging
Inertia
Inversion layer
Ionization
Ion thruster
Io (a moon of Jupiter)
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Satellite, Saturn, space station, stars, sun and Sputnik spacecraft (Russian) are space words. They begin with the letter s.
Flares are a space word. It begins with the letter f.
Six letter words starting with the letter "T"ThreatThreadTinkerTimingTakingTeamedToppedTriple
RoundRafterRunnerRinkRealRenderRottenRankRooster
6 letter words starting and ending with N:napkinnationneuronnotion
A few examples of 3-letter words starting with the letter O are:owloweoaroatown
Some three letter words starting with "s" are:sacsadsagsapsatsawsayseaseesetsewsexsheshysinsipsirsitsixslysobsodsonsopsotsowsoyspaspystysuesumsun
Here is a list of six letter words starting with Q:quakerquaggaquasarquezalquincequiver
Some six letter words starting with O are:objectoblongoccultocelotoddityoffendofficeorangeorioleorphanoverdooxygen
Universe...
Some four letter words starting with A are:ableacreafarajaralsoaltoareaAsiaautoaxle
positive words to describe some one starting with the letter V