Sun's Life Cycle: What Happens When Hydrogen Runs Out?

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What happens when the core of the sun heats up after the hydrogen supply runs out?

A fusion reaction in the next core zone begins (correct)

The sun starts to shrink and cool down

The sun's brightness decreases significantly

The earth is swallowed up by the expanded sun

What will happen to the core of the sun when the hydrogen supply runs out?

It will shrink and heat up (correct)

It will expand and cool down

It will disintegrate and disappear

It will remain the same size and temperature

What is the next phase of the sun after it becomes a Red Giant star?

Neutron Star

White Dwarf

Supergiant (correct)

Black Dwarf

What temperature threshold is needed for carbon fusion to occur?

$600$ million K Signup and view all the answers

What does the depletion of helium in the sun lead to?

Expansion of the sun into a Red Giant star Signup and view all the answers

What is the estimated duration for which the Sun can last on core hydrogen fusion?

5 billion years Signup and view all the answers

What happens to the core of the sun when it can no longer balance the pull due to gravity?

It shrinks and increases in temperature Signup and view all the answers

What is the primary cause of the extra warming on Earth, as mentioned in the text?

The effect of the sun's radiation being trapped by certain gases Signup and view all the answers

What is the main reason that certain gases are responsible for trapping the sun's radiation, while others are not?

Their specific energy levels as per quantum mechanics Signup and view all the answers

What is the approximate percentage increase in the concentration of CO2 in the atmosphere since 1750?

58% Signup and view all the answers

Which of the following gases are transparent to solar and earth radiation, as per the text?

N2 Signup and view all the answers

What is the main reason that molecules of certain gases can effectively trap the out-going radiation from the earth's surface?

Their specific energy levels as per quantum mechanics Signup and view all the answers

What is the average surface temperature of the Earth in Celsius, as mentioned in the text?

-13°C Signup and view all the answers

How much rise in the earth's surface temperature over the next 100 years is predicted due to the increased CO2 greenhouse effect, as per some estimates mentioned in the text?

$3-5°C$ Signup and view all the answers

What is the approximate percentage of the sun's radiation that reflects off our atmosphere, according to the text?

30% Signup and view all the answers

Sun's Life Cycle: What Happens When Hydrogen Runs Out?

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