Our Star

Front

What conditions are required for nuclear fusion of hydrogen to occur?

Back

A temperature of millions of Kelvins and high density.

Front

Why does the sun shine?

Back

Nuclear fusion.

Front

What is the temperature of the sun's core?

Back

Approximately 15 million degrees Celsius.

Front

Why can the Sun provide energy for billions of years?

Back

Nuclear fusion releases more energy than chemical combustion.

Front

Why are sunspots darker than the surrounding areas?

Back

The cooler gas releases less light.

Front

What is nuclear fusion?

Back

A process where two light atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is the primary fuel for the Sun's nuclear fusion?

Back

Hydrogen.

Front

What is the role of gravity in the Sun's structure?

Back

Gravity compresses the Sun's mass, creating the high pressure and temperature needed for fusion.

Front

What is the significance of the solar core?

Back

It is the site of nuclear fusion, where energy is produced.

Front

What are sunspots?

Back

Dark spots on the Sun's surface caused by magnetic activity that reduces surface temperature.