Front

What type of galaxy is characterized by a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge?

Back

Spiral Galaxy

Front

What is the name of the diagram that plots stars according to their brightness and temperature, helping to classify them into different groups?

Back

Hertzsprung-Russell (HR) Diagram

Front

Which group of stars in the HR Diagram is known for having a higher than average luminosity and a lower than average temperature?

Back

Supergiants

Front

What type of stars are typically found in the lower right corner of the HR Diagram, characterized by low temperature and low luminosity?

Back

Red Stars

Front

What is a nebula?

Back

A cloud of gas and dust in which new stars form.

Front

What is the relationship between a star's apparent brightness and its mass?

Back

Generally, the larger the apparent brightness, the greater the mass of the star.

Front

What type of stars are located on the main sequence of the HR Diagram?

Back

Stars that are in a stable phase of hydrogen burning, including our Sun.

Front

What is the significance of a star's color in determining its temperature?

Back

The color of a star indicates its surface temperature; blue stars are hotter, while red stars are cooler.

Front

What are giants in the context of the HR Diagram?

Back

Stars that are larger and more luminous than main sequence stars but have lower temperatures.

Front

What is a black hole?

Back

A region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.