1 Answer. If an elliptical galaxy is free of gas then it can't really "collapse" effectively, since there is no mechanism to dissipate the kinetic energy of the stars.
Can elliptical galaxies turn into spiral galaxies?
We know this because spiral galaxies rotate quickly (on an astronomical scale), while elliptical galaxies do not. There is no way that an elliptical galaxy could spontaneously begin rotating, so there is no way an elliptical galaxy could turn into a spiral galaxy.
Why can t the evolution of galaxies go from elliptical to spiral quizlet?
Why can't the evolution of galaxies go from elliptical to spiral? Without the gas and dust that are needed for star formation, elliptical galaxies can never become spiral, which are home to star formation and young stars.
Do spiral galaxies normally evolve into elliptical galaxies?
In practice, an isolated spiral galaxy will gradually turn into a lenticular (a.k.a. S0) galaxy, not into an elliptical. As it uses up its gas in forming stars, star formation will then gradually cease, and the visible spiral arms will weaken and fade away; you will be left with a smooth disk of stars.
What can cause a spiral galaxy to become elliptical?
The universe is a violent place, and collisions between galaxies are frequent — indeed, the Milky Way is due to crash into the Andromeda Galaxy in a few billion years. When two spirals collide, they lose their familiar shape, morphing into the less-structured elliptical galaxies.
How do stars move in elliptical galaxies?
Unlike spirals, where the stars all orbit the center of the galaxy in the same direction, the stars in ellipticals move in random orbits.