you don't have to answer all.
1) explain what is meant by "cosmos"
2) how are Cepheid variables used to estimate very great distance in the universe?
3) what did the existence of galaxies reveal about the size of the universe?
4) what evidence is there that Earth is not the centre of the milky way?
5) describe how spectroscope is used to measure the speed at which a star is moving away from or toward Earth?
6) dark lines in the spectrum of a newly discovered star are found to have shifted toward the red end of the spectrum. what does this tell us about the star's motion?
7) if all galaxies around milky way appear to be moving away from it, why can we not assume that the milky way is the centre of the universe?
1) explain what is meant by "cosmos"
2) how are Cepheid variables used to estimate very great distance in the universe?
3) what did the existence of galaxies reveal about the size of the universe?
4) what evidence is there that Earth is not the centre of the milky way?
5) describe how spectroscope is used to measure the speed at which a star is moving away from or toward Earth?
6) dark lines in the spectrum of a newly discovered star are found to have shifted toward the red end of the spectrum. what does this tell us about the star's motion?
7) if all galaxies around milky way appear to be moving away from it, why can we not assume that the milky way is the centre of the universe?