Given that stars and planets initially form from the same gas and dust in space, some astronomers have posited that host stars (such as the Sun) and their planets (such as those in our solar system) are composed of the same materials, with the planets containing equal or smaller quantities of the materials that make up the host star. This idea is also supported by evidence that rocky planets in our solar system are composed of some of the same materials as the Sun.13 Mark For ReviewWhich finding, if true, would most directly weaken the astronomers’ claim? A) Most stars are made of hydrogen and helium, but when cooled they are revealed to contain small amounts of iron and silicate. B) A nearby host star is observed to contain the same proportion of hydrogen and helium as that of the Sun. C) Evidence emerges that the amount of iron in some rocky planets is considerably higher than the amount in their host star. D) The method for determining the composition of rocky planets is discovered to be less effective when used to analyze other kinds of planets.

In terms of compositionGroup of answer choicesall planets condensed from the same nebula, and have similar compositions.the Sun is unique, made of nothing but hydrogen and helium.the jovian planets are made only of ice, and the terrestrials only of rock.the jovian planets are more like the Sun than are the terrestrials.the terrestrials are more like the Sun, since they formed close to it.

What can we learn about the formation of our solar system by studying other stars? Explain.

Stars are formed from large clouds of matter that include gas and dust. The clouds has a low density and includes elements such as hydrogen and helium, which have few protons and neutrons in their nuclei. Over a long period of time, the matter is pulled together by gravitational forces. Eventually, the matter collapses into ball and a star is born.What does this information provide evidence for? A. It provides evidence that galaxies are formed from clusters of stars pulled together by gravitational forces. B. It provides evidence that the elements in the universe are created by reactions that occur within stars. C. It provides evidence that there was once a period of rapid expansion in the universe when matter was spread far apart. D. It provides evidence that stars of all sizes go through the same distinct phases of change over similar amounts of time.

Describe how the chemical composition of a star may be determined.

Describe the differences in the chemical makeup of the inner and outer parts of the solar system. What is the relationship between what the planets are made of and the temperature where they formed?