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What is the difference between avatar and this space shuttle demonstrator?Actually, that isn't when problem when you are working & investing time & money on some good things.
How long scientists worked on gravitational waves?
Humanity is working to study universe from beginning, scientists are searching for extraterrestrial life from long ago.
ISRO worked on cryogenic engine from 80s & succeeded recently.
ISRO is working on Avatar from 90s & I think in reality project started after 2003-04 will take another decade & half.