What does the presence of a lot of iron in a star indicate?
2ND question :
The earth's core consists of a large amount of iron. According to the Big Bang theory, where did the iron come from?
3RD question :
The earth consists of many elements that are heavier than iron. According to the Big Bang theory, where did these heavy elements come from?
4TH question :
The solar core holds about 50% of the sun's total mass, but takes up only about 1.5% of its total volume. Explain how this could be true.
Please, when you answer the question put it in order because sometimes I get confused.
THANKS FOR WHO EVER WILL ANSWER THE QUESTION !!
Well, the presence of a lot of iron in a star would indicate the start is probably at the end of its life-cycle. Stars fuel themselves with hydrogen and helium in a process called nuclear fusion, where atomic nuclei are fused together, releasing energy and producing larger-nuclei elements, like iron.
For Earth, the center of the Earth is composed of two cores, an inner and an outer. The inner core is composed primarily of a high percentage of solid iron, while the outer core is composed of a liquid iron-nickel mixture. The source of all these elements could possibl come from the aforementioned nuclear fusion, which fuses elemental nuclei together.
As for the heavier-than-iron elements, nuclear fusion reaches an endpoint, normally around the oxygen or nitrogen elements in stars. It might be a possibility the heavier elements were the result of early collisions with other planetary material. It might also be a result of the tremendous heat and pressures associated with the interior of the Earth. To date, most of the knowledge we have about the interior of the Earth is indirect, without direct contact.
And finally, for the last question, you have to understand the formula for density, which is mass divided by volume. If you have more dense elements in the suns core, they will represent more mass, but occupy less volume. That will give you a larger percentage number for the mass (50%) and a lower number on the volume (1.5%).