Astronomy Stars and Stellar Evolution

Question 1

What is the Hertzsprung-Russell diagram used for?

Accepted Answer

Plotting stars by luminosity versus temperature to reveal stellar classification and evolutionary stages

Answer

Mapping star positions in the sky

Answer

Predicting eclipses

Answer

Measuring distances to galaxies

Question 2

What process powers stars on the main sequence?

Accepted Answer

Nuclear fusion of hydrogen into helium in the core

Answer

Chemical combustion of gases

Answer

Gravitational collapse alone

Answer

Radioactive decay of heavy elements

Question 3

What is a neutron star?

Accepted Answer

An extremely dense remnant of a massive star's core after a supernova explosion

Answer

A star made entirely of neutrons from its birth

Answer

A type of dark matter

Answer

A star that emits only neutrons instead of light

Question 4

What determines whether a dying star becomes a white dwarf, neutron star, or black hole?

Accepted Answer

The mass of the star's remaining core after its outer layers are expelled

Answer

The star's color

Answer

The star's age

Answer

The star's distance from Earth

Question 5

What is a supernova?

Accepted Answer

A catastrophic explosion marking the death of a massive star, briefly outshining an entire galaxy

Answer

A star that slowly fades away

Answer

A new star being born

Answer

A cluster of very bright stars

Question 6

What is stellar parallax and how is it used to measure distances?

Accepted Answer

The apparent shift in a star's position as Earth orbits the Sun, used to calculate distance to nearby stars

Answer

The color change of a star during its lifetime

Answer

The twinkling effect caused by Earth's atmosphere

Answer

The difference in brightness between two stars