Euphemisms such as dark matter are conceptual band-aids to failed cosmological theorizing. The missing energy that causes expansion, apparent acceleration of expansion is not dark matter but simply fields of energy outside our present realms of conception or ability to recognize.

Look at the universe We have field within field within field within field - ad infinitum. Sure you can call a field by other names such as galaxy, star, planet, or whatever one wishes (even a person!) , but in the end after the smoke clears away you have pure energy expressing in intricate fields from the sub-atomic level on up - and this is important - all are interconnected.

The fields that sustain galaxies and provide a birthing ground for them are the same fields that cause expansion and movement of these same galaxies.

Dark matter conjures up images of matter that doesn't emit light and somehow is a polar opposite to normal matter. Really 'dark matter' as used by most cosmologists is synonymous with 'An unknown force.'

This unknown force moves at light speed and like all energy must be capable of being measured and interfaced even though cosmologists haven't yet a clue where or how to measure (or even isolate) this influence. As such it is not really dark at all - and a better name for it would be 'mysterious matter' or even better 'mystery force'.

To be quite honest, I suspect you, me and everyone else are constantly interfacing with what some call 'dark matter' and that all galaxies ride the 'dark matter' field of force 24/7. And if this is the case, I also suspect the stuff's not dangerous, nor does it emit darkness.

;-)