Our sun is 2.3 × 104 (light years) from the center of our milky way galaxy and is moving in a circle around that center at a speed of 250 / one light year is the distance like travels in one year. if the speed of light is 2.998 × 108 m/ how long does it take the sun to make one revolution about the galactic center? b) how many revolutions has the sun completed since it was formed about 4.5 × 109 years ago? take one year as 365 days for your calculations.

. west

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.