What causes the long tail to protrude from this galaxy?
A: A supernova explosion blew material out in that direction.
B: The galaxy is moving so fast through space that it's leaving a trail of heavier matter behind.
C: A unique and yet unexplained phenomenon creates an anti-gravity effect that's pushing stars out of the galaxy.
D: Tidal forces caused by interaction with another galaxy are drawing the material off.
E: An incredibly powerful extraterrestrial civilization is reshaping the galaxy to suit its tastes.
Ans: D: Tidal forces caused by interaction with another galaxy are drawing the material off.
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