The earth sorround the Sun with a period of 365.25 days. An extraterrestrial creatures who live in other solar system observing the Earth's motion around the sun. If this solar system is moving away from the sun at a constant speed of 2000 km / sec,
a. Explain (with the image) according to extraterrestrials creatures, why the orbital period of the Earth is not 365.25 days!
b. How many days the period of the observed Earth orbit by the this creatures?
For Astronomy lovers who would love to discuss about celestial objects.