Question

* Which galaxies have a population of stars which is OLDER: Elliptical or Spiral galaxies? Explain how and why the age of the population of stars affects the colors of Elliptical and Spiral galaxies.

Answer 1

Solution:

Earlier our astronomers categorized groups of stars within the Milky Way into stellar populations. The two types of stellar populations had been recognised population I and population II among the star in our own galaxy.

Two main devisions were defined as population I and population II with another newer devision is called population III .

Elliptical galaxy is older than spiral galaxy.

Astronomers have identified more spiral galaxies than ellipticals, but that's simply because the spirals are easier to spot. While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born. The existing stars inside an elliptical galaxy tend to be older, giving off more red light than younger stars.