The answer is "have elliptical orbits"
The planets in our solar system including our home planet earth have an elliptical orbits instead of circular orbits. Because the circular orbits represents the perfect balance in velocity and gravity force. Planets differs in distance from the sun. Also, the planets are not measured in light years.
A fullerene is an allotrope of carbon in the form of a hollow sphere, ellipsoid, tube, and many other shapes. Spherical fullerenes, also referred to as Buckminsterfullerenes or buckyballs, resemble the balls used in association football. Cylindrical fullerenes are also called carbon nanotubes (buckytubes).
When the ruler is broughı near the inetal knob, it repels electrons in the metal. Electrons move away froni the ruler and down the metal rod. The knob now has a positive charge. The thin pieces of metal foil at the bottom of the metal rod now have a negative charge.
Answer: c
Explanation:
Sound waves cannot travel through a medium