Rocket, Rings of Saturn.
Radio telescope
Red dwarf star
Red giant star
Redshift (Doppler effect, etc.)
Retrograde (motion)
Regulus (star)
Rigel (star)
Radiant (of meteor showers)
· rockets
· Rovers (US exploration of Mars)
Radiant (Meteor showers)
radiation
Radio astronomy
redshift
red dwarf, red giant
Revolution, rotation, retrograde motion
Rigel, Regulus (stars)
Rings (around planets)
Rhea is one of the many moons around Saturn. Rosalind is one of the many moons around Uranus.
· radiation
Solar Radiation
Raagi
emue
The antonym for forward is backward, but the opposite direction can be reverse or rearward.
Raspberry
Rhode Island is a U.S. state. It begins with the letter R.
a space word for R could be Rhea the moon of saturn.
Retard is a negative word starting with "r".
A six letter word for a bird of prey starting with the letter R is "raptor."
· Uranus
A word that starts with an R that describes you is responsible.
random
Ravishing like you
resect
recover
rotogravure
· Hubble telescope
star