Why do the planets "drift" east relative to the stars and then move west for periods of time?
A) They are moving in the same rotation sense as the earth around the sun, but as the earth moves faster (or slower, depending on the planet) the motion appears to be backwards.
B) They are moving in large elliptical orbits, so when observed from Earth, their motion changes depending on whether they are near or far from the sun at a given time.
C) They are moving in separate orbits around the sun as it goes around the earth, producing the periodic backtracking.
D) They don't move, they stay fixed relative to the stars.
A
You might also like to view...
P and S waves do not follow simple paths as they pass through Earth; they speed up, slow down, and change direction, and S waves even disappear when they reach Earth's core.
Answer the following statement true (T) or false (F)
If the mass of an object remains unchanged, a constant net force on it produces a constant
A. velocity. B. acceleration. C. both of these D. none of the above
Explain the difference between threshold dose-response models and nonthreshold dose-response models.
What will be an ideal response?
Which of the following would be a good cap rock for oil and natural gas deposits?
A) Shale B) Sandstone C) Limestone D) Conglomerate