The spectral lines. Each element has a characteristic "fingerprint" in a spectrum.
Iron is not formed in the Sun through nuclear fusion. Iron is the element with the highest nuclear binding energy per nucleon, making it less energetically favorable for fusion reactions to produce iron in the Sun. Iron is typically formed in the later stages of a massive star's life during a supernova explosion.
A comet would not have enough iron to affect the Sun in any measurable way. Even a Jupiter-sized planet made of iron would not stop solar activity. The production of iron by a star is an endothermic fusion reaction. Any mass of iron nearing the Sun would be vaporized, and whatever entered the solar interior would circulate for many hundreds of years before any could reach the core.
The element uranium is named for the seventh planet from the Sun, Uranus.
The effect that Earth's gravity has on other planets and the sun can be calculated. This degree of gravity that is demonstrated points to a heavy core that is metal. Fragments of nickel-iron meteorites that are remnants of planetary collisions also indicate that other planets have a nickel-iron core.
Oxygen is the element which, in the allotropic form known as ozone, absorbs UV rays from the sun. Off course, lots of other elements will do so. UV radiation does not penetrate lead, iron, zinc, etc. But those elements are not found in the atmosphere. It's the ozone that matters.
The spectral lines. Each element has a characteristic "fingerprint" in a spectrum.
Iron is an element, and is the heaviest element that may be made by fusion in a Star such as our Sun.
Iron is an element, and is the heaviest element that may be made by fusion in a Star such as our Sun.
Iron is a chemical element. It is not a compound or a mixture. An element is a substance composed of only one type of atom. In the case of iron, it consists entirely of iron atoms. Iron is one of the 118 known chemical elements and is represented by the symbol "Fe" on the periodic table. It is a fundamental building block of matter and cannot be broken down into simpler substances through chemical reactions.
The most common gas is hydrogen, the next most common is helium, after that the sun contains lower levels of every element on the periodic table (the heaviest elements from iron through uranium were introduced either when the sun originally formed or came in on objects that fell into the sun). All elements (even uranium) are gasses at the temperatures inside the sun!
Not directly. Oxygen makes iron rust, and water helps.
Iron is not formed in the Sun through nuclear fusion. Iron is the element with the highest nuclear binding energy per nucleon, making it less energetically favorable for fusion reactions to produce iron in the Sun. Iron is typically formed in the later stages of a massive star's life during a supernova explosion.
Right now, hydrogen is fusing into hydrogen. As the hydrogen gets used up, helium will begin fusing into the next heavier element. When the helium is about used up, the next heavier element will begin fusing into the next . . . . well, keep on going until you get iron as the result of fusing. The Sun has not enough pressure and heat to fuse iron into anything heavier, and the Sun will blossom out into a red giant. Of course, this is billions of years from now . . .
There are a lot more. Each element has several possible absorption lines. In fact the element iron has several hundred lines.
The sun's main present element is hydrogen.
A comet would not have enough iron to affect the Sun in any measurable way. Even a Jupiter-sized planet made of iron would not stop solar activity. The production of iron by a star is an endothermic fusion reaction. Any mass of iron nearing the Sun would be vaporized, and whatever entered the solar interior would circulate for many hundreds of years before any could reach the core.
Hydrogen is the most common element in the universe, and in the Sun.