Which of the following is NOT a characteristic of a spiral galaxy?
A) most of its material is in the shape of a flattened disk
B) it has quite a bit of gas and dust in it
C) it has young stars and bright emission nebulae
D) when we take spectra of its stars, they have far less of the heavier elements than the Sun
E) the bright stars in it can be seen organized into distinct spiral arms

Question

Quizplus · Accepted Answer

Spiral galaxies actually have stars with more heavy elements than the Sun because they have gone through more generations of star formation, with each generation producing heavier elements than the one before it. This is known as the "metallicity" of stars, and spiral galaxies have a higher metallicity than many other types of galaxies.

Which of the Following Is NOT a Characteristic of a Spiral