Terra Firma (If that's what you mean by space word)
Some six letter words beginning with T are:tackletampertangletellertempertemplethirsttimbertissuetoilettonguetoppletorquetorridtrickytripletumulttundraturkeyturtle
weather satellites
The word is terror.
tailors
One possibility is the word genesis.
A space word that begins with T is trajectory.
Tantamount = Equivalent to
Some six letter words beginning with T are:tackletampertangletellertempertemplethirsttimbertissuetoilettonguetoppletorquetorridtrickytripletumulttundraturkeyturtle
thoughtlesstrashy
torque
weather satellites
Internet is a word beginning with I and ending with T.
a take
start
waistwaitwalletwarrantwasn'twartwentweren'twhatwheatwitwicketwombatwon'tworst
teleconferencetechnicalitiestransformation
tantamount