Please help??

Question

which theory is best supported by a doppler shift of spectral lines toward the red end of the spectrum? 1.creation of the solar system,2.expanding universe,3.nature of light energy,4.formation of impact craters

According to the big bang theory,the universe began as an explosion andit still expanding. this theory is supported by observations that the stellar spectra of distant galaxies show a 1.concentration in the yellow portion of the spectrum,2.concentration in the green portion of the spectrum,3.shift toward the blue end of the spectrum,4.shift toward the red end of the spectrum

a start of high surface temperture and low luminosity is most likely a 1.giant star,2.main sequence star,3.supergiant star,4.white dwarf star

why does a star with a high amount of matter tend to have a short life? 1.it rotates rapidly,2. it consumes it fuel rapidly,3.it has a core of heavy element,4.it collapses to form a white dwarf

Answer 1

Question 1) 2 - a red shift indicates that the source is moving away relative to the observer. All extragalactic objects normally show this.

Question 2) 4 - See question 1. Astrophysics questions tend to repeat to confirm your knowledge.

Question 3) 4 - White dwarfs is the correct answer. Consult the attached H-R diagram.

Question 4) 2 - I know this.

Answer 2

first question is 1, 2 and 3. .

later ones don't know

Answer 3

first:2
second:4
third: um I don't know
fourth: again I don't know