Types of galaxies

What is the primary force responsible for pulling together clouds of dust and stars to form galaxies?

• Electromagnetic force

• Strong nuclear force

• Gravity

• Weak nuclear force

Which type of galaxy is the most common, accounting for 77% of all known galaxies?

• Elliptical

• Spiral

• Irregular

• Barred Spiral

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Which characteristic is typical of elliptical galaxies?

• They have prominent spiral arms and a central bulge.

• They are composed of younger, high-mass stars and have abundant gas and dust.

• They have an oval shape, lack a central bulge, and are composed of older, lower-mass stars.

• They have no distinct shape and are often formed by gravitational forces from other galaxies.

What is a defining characteristic of irregular galaxies?

• They always have a distinct, symmetrical shape.

• They are typically larger than spiral galaxies.

• They often lack a distinct shape, bulge, or spiral arms.

• They are primarily composed of young, blue stars.