Unit 4 science 8th grade universe

Front

What is luminosity?

Back

Luminosity is the total amount of energy emitted by a star per unit of time, often measured in watts.

Front

How does the size of a star affect its luminosity?

Back

Larger stars generally have higher luminosity because they have more surface area to emit light and energy.

Front

What is nuclear fusion?

Back

Nuclear fusion is the process in which two atomic nuclei combine to form a heavier nucleus, releasing energy in the process.

Front

What happens to low mass stars like our Sun after they exhaust hydrogen in their core?

Back

They swell and expand into red giants.

Front

What is the color of the hottest stars?

Back

The color of the hottest stars is blue.

Front

What is a red giant?

Back

A red giant is a late stage in the life cycle of a star, characterized by a large size and a reddish color, occurring after the star has exhausted its hydrogen fuel.

Front

What is a white dwarf?

Back

A white dwarf is a small, dense star that is the remnant of a low mass star after it has shed its outer layers and stopped nuclear fusion.

Front

What is a supergiant star?

Back

A supergiant star is an extremely large star that has a high luminosity and is in a late stage of stellar evolution.

Front

What role does surface temperature play in determining a star's color?

Back

A star's surface temperature determines its color; hotter stars appear blue, while cooler stars appear red.

Front

What is the life cycle of a star?

Back

The life cycle of a star includes stages such as protostar, main sequence, red giant or supergiant, and finally, either a white dwarf, neutron star, or black hole.