Halley's comet orbits the sun roughly once every 76 years. it comes very close to the surface of the sun on its closest approach. how far from the sun is halley's comet at its furthest point, the aphelion?

In the diagram below, ab and bc are tangent to o. what is the measure of

What is the approximate chemical composition of the solar nebula?

Which of the following characteristics define a state? check all that apply. a. a population of people b. a sovereign government that determines how a group of people is ruled c. an army, military, or police force d. a territory with set borders