The milky way galaxy is about 25 million times larger in diameter than the planetary region of our solar system. if you represent out solar system with a poker chip (diameter about 1.5 inches), how big a disk would you need to represent out galaxy?

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point