The Universe and Semester Exam practice

Front

What is a galaxy?

Back

A galaxy is a massive system that consists of stars, star clusters, planetary systems, gas, dust, and dark matter, bound together by gravity.

Front

What are the four main types of galaxies?

Back

The four main types of galaxies are Spiral, Elliptical, Irregular, and Lenticular.

Front

What is a Spiral galaxy?

Back

A Spiral galaxy is a type of galaxy characterized by its spiral arms that wind outward from the center, containing stars, gas, and dust.

Front

What is an Elliptical galaxy?

Back

An Elliptical galaxy is a type of galaxy that has an ellipsoidal shape and lacks the distinct features of spiral galaxies, often containing older stars.

Front

What is an Irregular galaxy?

Back

An Irregular galaxy is a type of galaxy that does not have a distinct regular shape, often containing a mix of young and old stars.

Front

What is a Lenticular galaxy?

Back

A Lenticular galaxy is a type of galaxy that has a central bulge and a disk but lacks the spiral arms of a spiral galaxy.

Front

What galaxy contains the sun and its solar system?

Back

The Milky Way galaxy contains the sun and its solar system.

Front

What is the Small Magellanic Cloud?

Back

The Small Magellanic Cloud (SMC) is a dwarf irregular galaxy that is a satellite of the Milky Way, containing millions of stars.

Front

What is the significance of dark matter in galaxies?

Back

Dark matter is a form of matter that does not emit light or energy, and it is believed to make up a significant portion of the total mass in galaxies, influencing their structure and behavior.

Front

What is the difference between a star and a galaxy?

Back

A star is a luminous celestial body made of plasma, while a galaxy is a vast collection of stars, gas, dust, and dark matter.