Examples:
You are a particle in space, that moves stars and galaxies
That make my star-struck heart, warm up
Creating a supernova, bursting into light and love
A supernova defying physics
Unable to collapse into a black hole
Because as long as I am with you, my heart is whole
Do not use "like" or "as ... as":
"Life is like a box of chocolates."
"Your heart is as cold as ice."
This is a simile, not a metaphor.
Metaphors is a direct comparison:
"My life is an open book"
"You are particle in space"