Stop & Jot 1. Why do we have day & night?
2.
Is it the same time (3pm) everywhere in the world? (Hint: If it is 3pm in Boston will it be 3pm
everywhere else in the world?)
3. Why is it summer in one part of the world and winter, in another part?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.