Gr 9 NATURAL SCIENCES: Ch 4.5 Life of a star

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What is the stage of a star's life cycle where it fuses hydrogen into helium in its core?

Star birth

Main sequence star (correct)

Star death

Red giant star

Which of the following factors determines a star's characteristics, such as color, size, and lifespan?

Surface temperature

Mass of the star (correct)

Distance from Earth

Core temperature

What is the color of a star with a surface temperature of 40,000°C?

Red

Blue (correct)

Green

Yellow

Which type of star has a lifespan of up to 100 billion years?

Red dwarf Signup and view all the answers

Why do massive stars have shorter lifespans than smaller stars?

They consume their nuclear fuel more rapidly Signup and view all the answers

What happens to the star's core when the hydrogen is depleted?

It contracts and heats up Signup and view all the answers

What is a characteristic of a red giant star?

An expanded size and increased brightness Signup and view all the answers

What type of fusion begins in the core of a red giant star?

Helium fusion Signup and view all the answers

What happens to the star after the red giant phase if it is a star like the Sun?

It becomes unstable and proceeds to the next stage of its evolution Signup and view all the answers

What elements are produced in the core of a red giant star?

Heavier elements like carbon and oxygen Signup and view all the answers

What is the primary factor that determines the length of a star's main sequence stage?

The star's mass Signup and view all the answers

What is the relationship between the surface temperature of a star and its color?

Hotter stars appear bluer Signup and view all the answers

Which of the following statements about main sequence stars is true?

They vary in mass and color Signup and view all the answers

What is the fate of a star with 10 times the mass of the Sun?

It will last for about 20 million years Signup and view all the answers

What is a characteristic of a star that is 'born'?

Nuclear fusion reactions have begun in its core Signup and view all the answers

What is the result of the core contraction in a star transitioning to a red giant?

The outer layers expand and cool. Signup and view all the answers

What is the significance of the core temperature in a red giant star?

It initiates helium fusion. Signup and view all the answers

What happens to a star like the Sun after the red giant phase?

It leads to its eventual death. Signup and view all the answers

What is a characteristic of a star in the red giant phase?

It has an expanded size and increased brightness. Signup and view all the answers

What is the fate of a star like the Sun due to its inability to fuse carbon and oxygen?

It leads to its eventual death. Signup and view all the answers

Which of the following factors is responsible for the observable characteristics of a star?

The mass of a star Signup and view all the answers

What determines the length of a star's lifespan on the main sequence?

The mass of the star Signup and view all the answers

What is the primary difference between a massive star and a red dwarf?

Their masses Signup and view all the answers

What is the consequence of a star consuming its nuclear fuel more rapidly?

It has a shorter lifespan Signup and view all the answers

What is the relationship between the surface temperature and color of a main sequence star?

Hotter stars are bluer, and cooler stars are redder Signup and view all the answers

What is the primary reason for the star's outer layers to expand during the transition to a red giant?

The core contraction causes the outer layers to heat up and expand Signup and view all the answers

What is the significance of helium fusion in the core of a red giant star?

It produces heavier elements like carbon and oxygen Signup and view all the answers

What determines the fate of a star after the red giant phase, according to its mass?

The star's mass and core temperature Signup and view all the answers

What is the outcome of the star's evolution after the helium in the core is exhausted, for stars like the Sun?

The star becomes unstable and proceeds to the next stage of its evolution Signup and view all the answers

What is the relationship between the star's brightness and its size during the red giant phase?

The star's brightness increases as its size increases Signup and view all the answers