Nah. Gravity always pull things together. Dark matter is a crutch to explain why galaxes can keep together. Dark energy is the crutch to explain why the red shift is accelerating (that means that the universe is expanding faster and faster). That's why it's so vague and will probably be another aether.
Atm the estimations shows that about 5% is visual matter, 27% dark matter and 68% is dark energy. That's a lot of "we have no idea".
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