[adorno]

Invisible, yet undoubtedly there — scientists can measure its effects — its exact characteristics remain elusive.

Unlike normal matter particles, physicists believe, they do not collide and scatter like billiard balls but rather simply pass through each other.

Collisonless? Invisible? Apparently do not interact with other matter, including dark matter? Yet, dark matter shapes most of the universe?

I'll bet that changes in these theories will be forthcoming in the near or slightly more distant future. Tough I probably won't be around to read about it.

[PatrickHenry]

Collisonless? Invisible? Apparently do not interact with other matter, including dark matter? Yet, dark matter shapes most of the universe?

I post; you decide.

[longshadow]

Apparently do not interact with other matter, including dark matter? Yet, dark matter shapes most of the universe?

Of course they "interact with other matter" -- that's the point of the article: the gravitational interaction of dark matter with other matter (including dark matter) in the universe. The simulation of that predicted gravitational interaction produces a distribution of matter that matches what we see.