Understanding Cosmic Distances

What is the principle behind using parallax to measure the distance to nearby stars?

• The apparent shift in position of stars against distant backgrounds.

• The gravitational pull between stars and planets.

• The change in brightness of stars over time.

• The color change of stars as they move.

How do standard candles help astronomers measure distances in space?

• By measuring their gravitational influence on nearby objects.

• By observing their speed of rotation.

• By using their known luminosity to calculate distance.

• By comparing their size to other celestial objects.

What is a limitation of using standard candles to measure cosmic distances?

• They can only be used for objects within our solar system.

• Their luminosity can be affected by interstellar dust.

• They require direct observation from space telescopes.

• They are only visible during certain times of the year.

How does the Doppler effect relate to the study of galaxies?

• It determines the size of galaxies based on their sound waves.

• It helps measure the speed at which galaxies are moving away from us.

• It describes the change in color of galaxies as they move.

• It explains the gravitational pull between galaxies.

Why do more distant galaxies appear to have a greater redshift?

• Because the universe is expanding, stretching the light waves.

• Because they are smaller in size.

• Because they are moving towards us.

• Because they emit more light than nearby galaxies.