Stars & H-R Diagrams

Front

What is the H-R Diagram?

Back

The Hertzsprung-Russell (H-R) Diagram is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What are the main characteristics used to classify stars?

Back

The main characteristics used to classify stars include color, temperature, size, and brightness.

Front

What is absolute magnitude?

Back

Absolute magnitude is the brightness of a star as it would appear from a standard distance of 10 parsecs, independent of its distance from Earth.

Front

What is a galaxy?

Back

A galaxy is a collection of stars, dust, and gas bound together by gravity.

Front

How does the temperature of stars change on the H-R Diagram?

Back

As you move from right to left on the H-R Diagram, the temperature of stars increases.

Front

What is the difference between apparent magnitude and absolute magnitude?

Back

Apparent magnitude is how bright a star appears from Earth, while absolute magnitude is its brightness at a standard distance.

Front

What type of star is our Sun classified as?

Back

Our Sun is classified as a G-type main-sequence star (G dwarf), which is medium size with a medium temperature.

Front

What happens to a star's color as its temperature increases?

Back

As a star's temperature increases, its color shifts from red to blue.

Front

What is a supernova?

Back

A supernova is a powerful and luminous explosion of a star, marking the end of its life cycle.

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What are red giants?

Back

Red giants are large stars that have expanded and cooled, resulting in a reddish appearance.