what type of galaxy do astronomers consider to be the oldest?

It's urgent because I am studying for a grade 9 exam but I don't know what this is.. please help.

http://www.google.com/#q=oldest+galaxy

The type of galaxy that astronomers consider to be the oldest is known as an elliptical galaxy. Elliptical galaxies are typically smooth and featureless, with a mostly spheroidal or ellipsoidal shape. They are composed mainly of older stars, containing little to no interstellar gas and dust.

Now, to find the answer to this question on your own, you can follow these steps:

1. Start by understanding the different types of galaxies. There are three main types: spiral galaxies, elliptical galaxies, and irregular galaxies.

2. Research each type of galaxy and their characteristics. Pay particular attention to their shapes, composition, and the age of the stars they contain.

3. Consider the characteristics of each galaxy type and think about which one may be the oldest based on the information you gathered.

4. Look for additional sources, such as textbooks, online articles, or educational websites, to further confirm your findings.

Remember, it's important to understand the concepts rather than just memorizing the answer. This will help you recall and apply the information more effectively during your exam.