The hydrogen "bridge" between Andromeda Galaxy and the Triangulum Galaxy, - What doe

What does it mean???
Between the two spiral galaxies there is a Hydrogen cloud bridge. The two galaxies are traveling at ultra high speed in the space, but at full synchronization with each other. This enables them to maintain the Hydrogen Bridge. In the past the two galaxies were close to each other. Never the less, there is no evidence for collision between those galaxies. Andromeda is a supper giant spiral Galaxy.


http://www.sciencedaily.com/releases...0508131700.htm
http://www.sciencedaily.com/releases...0611193632.htm
"The new observations confirm a disputed 2004 discovery of hydrogen gas streaming between the giant Andromeda Galaxy, also known as M31, and the Triangulum Galaxy, or M33."
"The hydrogen "bridge" between the galaxies was discovered in 2004 by astronomers using the Westerbork Synthesis Radio Telescope in the Netherlands "
"The GBT was also able to track the motion of these newly discovered clouds, showing that they were traveling through space at velocities similar to M31 and M33"
"The researchers also speculate that these clouds may represent a new and previously unrecognized source of neutral hydrogen gas that could eventually fall into M31 and M33, fueling future generations of star formation."
"The properties of this gas indicate that these two galaxies may have passed close together in the distant past," said Jay Lockman, of the National Radio Astronomy Observatory (NRAO). "Studying what may be a gaseous link between the two can give us a new key to understanding the evolution of both galaxies," he added.
"We think it's very likely that the hydrogen gas we see between M31 and M33 is the remnant of a tidal tail that originated during a close encounter, probably billions of years ago," said Spencer Wolfe, of West Virginia University. "The encounter had to be long ago, because neither galaxy shows evidence of disruption today,"
Wiki - "Triangulum may be home to 40 billion stars, compared to 400 billion for the Milky Way, and 1 trillion (1000 billion) stars for Andromeda."

Based on that, we have to ask the following questions:
1. How close together they were in the past?
2. If they were close enough, why the gravity didn't force them to collide?
3. If they had been forced to collide, why there is no sign for collision?
4. Is there any meaning for the fact that Andromeda is like a giant mother Spiral Galaxy while the Triangulum is like a baby Spiral galaxy.
5. If they are moving in space at Ultra High Speed (Both are facing the Milky way galaxy), how come that they are only drifting apart? What is the speed for this drifting?
6. Is it feasible that they were one galaxy in the past???
7. What is the source for this Hydrogen Bridge?
8. Why they are moving in full synchronization and maintain the hydrogen bridge. (For me it looks like an Umbilical cord…)
9. Is it possible that the galaxies generate a steady stream of Hydrogen while they are drifting apart?
10. Therefore, is it feasible that those spiral galaxies have the ability to generate New Hydrogen Atoms?