Answer:
light doesn't need a medium through which to travel because the speed of light is experimentally constant
Answer:
When these waves reach our ears, they make our eardrums vibrate, and we hear the sound of the bell ringing.
Explanation:
Orbits<span> of </span>planets are typically elliptical, and the central mass being orbited is at a focal point of the ellipse. The planet stays in orbit due to a strong atmosphere and gravity. Also, the planet's inertia would keep it on course. Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.