Life Cycle of a Star

Question 1

Which of the following observations is the best evidence that the universe is expanding?

Accepted Answer

Red‑shift of light from distant galaxies

Answer

Stars in the Milky Way becoming hotter over time

Answer

Increase in the number of planets in the solar system

Answer

Blue‑shift of light from distant galaxies

Question 2

A research group is writing down every major phase that a star with the same mass as the Sun will go through, starting from the original cloud of gas and ending when the star’s core becomes a white dwarf. Which list shows those phases in the correct chronological order?

Accepted Answer

Nebula → Protostar → Main sequence → Red giant → Planetary nebula → White dwarf

Answer

Nebula → Main sequence → Protostar → Red giant → Planetary nebula → White dwarf

Answer

Nebula → Protostar → Main sequence → Red giant → Supernova → White dwarf

Answer

Nebula → Protostar → Red giant → Main sequence → Planetary nebula → White dwarf

Question 3

Which of the following observations provides the strongest evidence that the universe is expanding?

Accepted Answer

Light from distant galaxies is shifted toward longer wavelengths (red‑shift).

Answer

All stars in our galaxy are moving away from Earth at the same speed.

Answer

The cosmic microwave background radiation has the same temperature in all directions.

Answer

Light from distant galaxies is shifted toward shorter wavelengths (blue‑shift).

Try three questions

Which of the following observations is the best evidence that the universe is expanding?

A research group is writing down every major phase that a star with the same mass as the Sun will go through, starting from the original cloud of gas and ending when the star’s core becomes a white dwarf. Which list shows those phases in the correct chronological order?

Which of the following observations provides the strongest evidence that the universe is expanding?

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