Crossword puzzle clue "ideal spacecraft propulsion method"

Here are the possible solutions for ideal spacecraft propulsion method clue

Answer
Clue
Relevancy
antigravity
Clue
Ideal spacecraft-propulsion method
Definition
a hypothetical effect resulting from cancellation or reduction of a gravitational field
hydroponics
Clue
Method of growing plants that... look, it's for weed, all right? You use this method to grow weed
Definition
the practice of growing plants in a chemical solution without soil
caltech
Clue
Jet Propulsion Laboratory site
Jet Propulsion Lab site
NASA's Jet Propulsion Lab partner
ego
Clue
Star's propulsion, maybe?
Definition
the 'I' or self
egotrip
Clue
Journey of self-propulsion?
engine
Clue
Propulsion device
Definition
to equip with machinery

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