Unit 10B

Front

What is a star?

Back

A huge ball of very hot gas that emits light and heat through nuclear fusion.

Front

What elements are commonly found in a star's spectra?

Back

Hydrogen and Helium are the most common elements found in stars, but other elements like Calcium can also be present.

Front

What is the initial stage of a star's life cycle?

Back

A nebula, which is a large cloud of gas and dust.

Front

What is the study of the universe called?

Back

Cosmology.

Front

What is a nebula?

Back

A nebula is a giant cloud of gas and dust in space, where stars are born.

Front

What is the process by which stars produce energy?

Back

Nuclear fusion, where hydrogen atoms combine to form helium, releasing energy.

Front

What is the difference between a star and a planet?

Back

A star is a luminous celestial body that generates energy through nuclear fusion, while a planet is a non-luminous body that orbits a star.

Front

What is a black hole?

Back

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

Front

What is a white dwarf?

Back

A small, dense star that is the remnant of a star that has exhausted its nuclear fuel.

Front

What is the significance of the Hertzsprung-Russell diagram?

Back

It is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.