[UCANSEE2]

The need for dark matter comes from the speculation that galaxies don’t have enough mass in them to keep the galaxy together.

How much mass does a tornado have ? How is it able to pick up immense objects ?

Space is full of small dark particles of dust that cannot be detected. We don’t know how much of it there is. Is that some of the missing ‘matter’ ?

[Telepathic Intruder]

"How much mass does a tornado have ? How is it able to pick up immense objects ?"

Momentum of the tornado and the surrounding air. Space is mostly vacuum, however, so it's a different problem. Something is holding galaxy clusters together beyond just the gravity created by visible matter, however. We call that "something" dark matter. And that's all we know for now.