Arrange these in order from smallest to largest: Spiral Galaxies, Elliptical Galaxies, and Irregular galaxies. I know that Irregular Galxies are the smallest.
And also: arrange them from least to greatest gravitational force
To arrange spiral galaxies, elliptical galaxies, and irregular galaxies in order from smallest to largest, you can consider the general size categories of each type.
1. Irregular galaxies: As you correctly mentioned, irregular galaxies are generally the smallest type of galaxies. They lack defined shapes and structures, making them irregular in appearance. Examples of irregular galaxies include the Large Magellanic Cloud and the Small Magellanic Cloud.
2. Spiral galaxies: Spiral galaxies are intermediate in size compared to irregular and elliptical galaxies. They have a spiral-shaped structure with arms of stars and interstellar matter. Spiral galaxies often have a central bulge and a rotating disk. Our own Milky Way galaxy is a prime example of a spiral galaxy.
3. Elliptical galaxies: Elliptical galaxies are generally the largest type of galaxies. They are named after their elliptical or nearly spherical shape. Unlike spiral galaxies, they lack the prominent disk and spiral arms. Elliptical galaxies can range from nearly spherical (E0) to highly elongated (E7). Examples of elliptical galaxies include M87 in the Virgo cluster and M32 in the Andromeda galaxy.
So, the correct order from smallest to largest is: Irregular galaxies, Spiral galaxies, and Elliptical galaxies.