It is the lightest element.
The Sun and its planets formed form a huge cloud (disk) of dust which contained both light and heavy elements, but there were more light elements (hydrogen) than heavy. As the disk coalesced into the sun and planets the areas close to the young sun were too hot (heated by the sun) for the light elements to condense and settle onto the young inner planets which are therefore rocky, while the outer planets being further from the sun did accumulate the lighter and more volatile elements. However in the centers of the giant planets there are rocky (heavy) cores.
No, hydrogen does not fission. Fission only occurs in heavy elements that are well past the peak in binding energy per nucleon (where binding energy per nucleon is decreasing), and fusion can only occur in light elements which are in the portion of the binding energy curve where binding energy per nucleon is increasing. When you fission a heavy element or fuse light elements, the product nuclei have higher binding energies per nucleon than the original element. This is where the energy release comes from. Check out the Wikipedia article on nuclear binding energy.
Light elements - most commonly hydrogen.
Transmutation occurs when a fusion bomb (H-bomb) detonates: The Primary (A-bomb/fission) converts a heavy element like plutonium or uranium into lighter elements, such as strontium, etc... The Secondary (H-bomb/fusion part) converts a light element into heavier elements, like Hydrogen into Helium.
the weight of the star doesn't matter.
Compared to Osmium it is light, compared to Hydrogen it is heavy
Heavy water is heavier than light water because instead of both hydrogen atoms in the molecule being ordinary light hydrogen (H - one proton) one or both hydrogen atoms are heavy hydrogen (D - one proton, one neutron).
Compared to a loaf of bread, all nuclear weapons are heavy. Compared to a truck, some are light and some are heavy.
The Sun and its planets formed form a huge cloud (disk) of dust which contained both light and heavy elements, but there were more light elements (hydrogen) than heavy. As the disk coalesced into the sun and planets the areas close to the young sun were too hot (heated by the sun) for the light elements to condense and settle onto the young inner planets which are therefore rocky, while the outer planets being further from the sun did accumulate the lighter and more volatile elements. However in the centers of the giant planets there are rocky (heavy) cores.
Aristotle
No, hydrogen does not fission. Fission only occurs in heavy elements that are well past the peak in binding energy per nucleon (where binding energy per nucleon is decreasing), and fusion can only occur in light elements which are in the portion of the binding energy curve where binding energy per nucleon is increasing. When you fission a heavy element or fuse light elements, the product nuclei have higher binding energies per nucleon than the original element. This is where the energy release comes from. Check out the Wikipedia article on nuclear binding energy.
The term is nuclear fusion, where light elements (usually hydrogen) fuse to form heavier elements.
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The original attomic bombs were fission weapons- heavy elements such as uranium and plutonium were fissioned (broken apart) into lighter elements, releasing energy. So called hydrogen bombs use fusion as part of their process. Very light elements, such as hydrogen, are fused (mashed together) and become heavier elements, releasing energy. You should note that fusion bombs usually use a fission weapon to start the nuclear reaction.
Light elements - most commonly hydrogen.
Jupiter contains the fewest heavy elements. Unlike other planets, Jupiter is a gas planet, and contains mostly light elements.
Transmutation occurs when a fusion bomb (H-bomb) detonates: The Primary (A-bomb/fission) converts a heavy element like plutonium or uranium into lighter elements, such as strontium, etc... The Secondary (H-bomb/fusion part) converts a light element into heavier elements, like Hydrogen into Helium.