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Physics/Regarding Sun and earth's distance

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Question
Hi,

I read that even Sun, earth and all planets are constantly moving towards the galactic centre. If it is so, how does the distance between Sun and earth remain constant? Please explain.

Regards

Answer
I do not know if your premise regarding the galaxy is true or not. In any case the distance between the Earth and the sun is NOT constant, it varies by a couple of million miles each year. In addition, gravitational forces acting on the Earth's oceans via tides is gradually removing energy for the Earth and as a result it is VERY slowly moving closer to the sun over time - billions of years! This same effect is also gradually making the day longer as well.

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James J. Kovalcin

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I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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