Author Question: You would like to know if a star is coming towards you or away from you. Therefore, you will need to ... (Read 23 times)

dollx · **on:** Jul 27, 2018

You would like to know if a star is coming towards you or away from you. Therefore, you will need to obtain the star's _______________ from its shifted spectra.

Fill in the blank(s) with correct word

Question 2

Earth is closest to the Sun during the month of January. Explain then why we do not experience our hottest weather in January in the northern hemisphere.

What will be an ideal response?

tkempin · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

radial velocity

Answer to Question 2

It is the tilt of the Earth on its rotational axis which gives rise to the seasons, not the relative Earth-Sun distance. In January, the northern hemisphere is tilted away from the Sun, so it is winter there.