Unit 6 The Universe Re-Test

Front

What is a nebula?

Back

A nebula is a large cloud of gas and dust in space, where new stars are formed.

Front

What is a protostar?

Back

A protostar is a 'baby' star that has not yet begun nuclear fusion.

Front

What determines a star's color?

Back

A star's color is primarily determined by its temperature.

Front

What process produces energy in the Sun?

Back

Energy in the Sun is produced by the process of nuclear fusion, where hydrogen is converted into helium.

Front

What is a supernova?

Back

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

Front

What is a neutron star?

Back

A neutron star is the remnant core of a massive star that has undergone a supernova explosion, composed mostly of neutrons.

Front

What is a galaxy?

Back

A galaxy is a massive system that contains stars, star clusters, planetary systems, and interstellar gas and dust, all bound together by gravity.

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 celestial body that orbits a star and does not produce its own light.

Front

What is the life cycle of a star?

Back

The life cycle of a star includes stages such as nebula, protostar, main sequence star, red giant, and supernova or white dwarf.

Front

What is the significance of the Hertzsprung-Russell diagram?

Back

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