100 POINTS IF YOU CAN ANSWER ALL QUESTIONS!! PLUS BRAINLIEST, THANKS, RATINGS, ETC

1. The Sun, like 80 to 90 percent of stars, is in which stage of life?

A. main sequence
B. stellar formation
C. red giant
D. dying star

2. How do scientists learn about the age of the solar system and its planetary bodies? Select the two correct answers.

A. using radiometric dating of meteorites
B. comparing the composition of the gaseous planets to the rocky planets
C. analyzing impact craters on planetary body surfaces
D. measuring distances between planets

3. Which describe the study of spectroscopy? Select the two correct answers.

a. the number of galaxies
b. interaction of light and atoms
c. emission and absorption of light
d. reflection of light by Earth

4. Which state of matter best describes the elements inside stars?

a. plasma
b. liquid
c. solid
d. gas

5. Which are examples of non-visible light?

a. white light from the sun and microwaves
b. radio waves and ultraviolet light
c. white light from a lightbulb and rainbows
d. rainbows and X-rays

6. Which is the first stage in the life cycle of a massive star?

a. black hole
b. white drawf
c. red giant
d. nebula

7. Which of these is a heavy element in a star?

a. carbon
b. hydrogen
c. lithium
d. helium

8. Why are spectral lines useful in classifying stars?

a. They show the layers that make up a star.
b. They show a star's location.
c. They indicate a star's age.
d. They show the composition of a star.

9. Which statement correctly explains how the Hertzsprung-Russell diagram helps to compare stars?

a. The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class.
b. Stars with the highest temperatures appear towards the right side of the Hertzsprung-Russell diagram.
c. The Sun's high temperature places it to the far left of the Hertzsprung-Russell diagram.
d. The Hertzsprung-Russell diagram plots stars according to their size and shape.