Which of the following best represents the speed of halley's comet when it is nearest to earth?
a.1 × 10^-5 kilometers per year
b.1 × 10^5 kilometers per year
c.1 × 10^-5 kilometers per hour
d.1 × 10^5 kilometers per hour

Thank you for posting your question here at . I hope the answer will help you. Feel free to ask more questions.
Among the choices provided above the one that best represents the speed of Halley's comet when it is nearest to Earth is letter D which is 1 × 10^5 kilometers per hour. 

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative.