What does "Line space 27 full" mean on facebook?
Put your helmet on, commencing countdown, engines on...
What do the word nasa space launch mean in the time line?
It means when did nasa space launch
What does it mean TV Full HD?
TVs that are made to receive and display the 1080 standard.
Why does a green squiggly line show up everytime I double space in mw?
It is a grammatical error, but otherwise, not important. If you're looking to indent paragraphs use the ruler atop the page, but there is no need to double space.