A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculate the approximate distance of the star from Earth? (3 points) Group of answer choices use doppler effect to calculate the shift in light traveling from star to Earth in summer use doppler effect to calculate the shift in light traveling from star to Earth in winter measure the parallax and use it in calculations measure the red shift of emitted light and use it in calculations

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

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the answer is barium and copper bromide