I am a fun of the documentary especially if it is about current Scientific project exploring space. Nowadays we are lucky to be able to receive such amazing photographs from the planets that we always thought to be simple and saw them just in 2d dimension. 

Seeing your painting that has almost everything in it the galactic clouds, which had normally so many forms that our imagination can think of, like your idea of dolphins the ambassadors of piece, community, family and kindness. Like that spaceship that is on its way to explore the space has probably the first colonist-pioneers who decided to make first step leaving our Earth and Moon but hoping to come back with good news. 
The whole appearance due to combination of blue and green colors, transmit the feeling of hope, life, peace.