Irregular, spiral and elliptical are all different shapes of galaxies which are used to classify them.
A True
B false
A False
A. True
A. True.
Explanations:
To determine the shape of a galaxy, astronomers use various classification systems. One of the most widely used classification systems is the Hubble sequence, which categorizes galaxies into three main types: elliptical, spiral, and irregular.
1. Elliptical galaxies: These galaxies have a smooth and rounded appearance, resembling an ellipse or oval shape. They are often featureless and lack prominent spiral arms or disk structures. Elliptical galaxies range from being almost perfectly spherical (E0) to highly elongated (E7), with the number indicating the degree of elongation.
2. Spiral galaxies: Spiral galaxies are characterized by their distinct spiral arms that extend from a central bulge or disk. They have a flat, disk-like structure with a prominent central region, where stars and gas are concentrated. Spiral galaxies are further divided into subcategories based on the tightness of their spiral arms and the size and brightness of their central bulges.
3. Irregular galaxies: Irregular galaxies do not have a specific shape like elliptical or spiral galaxies. They are typically asymmetrical and lack defined structure. Irregular galaxies can vary in size, and they often exhibit high levels of star formation activity.
Therefore, it is true that irregular, spiral, and elliptical are different shapes of galaxies used to classify them.