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stars undergo nuclear fusion, that is to say that the nuclei of 2 (or more) atoms literally combine. in stars it's hydrogen, and by combine i dont mean a chemical reaction. i mean that you take one proton, add another proton, and out comes a nucleus with 2 protons. so take 2 hydrogens (both 1 proton each) and use nuclear fusion to turn it into the atomic element with 2 protons known as helium
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The onset of which event marks the change of a protostar into a star?
the nuclear fusion of hydrogen into helium
What is the difference between a star and a protostar?
A "Star" can be anything from the beginning of a stars life (Protostar) up until it has died and only it's remnants remain (White dwarf, neutron star, black hole). However, for this question, we will assume that a "star" is when it is fusing hydrogen into helium, which is what most stars we see, including the Sun are doing. A protostar is the first stage in a stars life (See related question) whereas a "star" in this question is when there is enough pressure and thus temperature for the star to star fusing hydrogen into helium and it joins the main sequence - thus becoming a star (See related question)
How is a protostar different from a star?
A star begins its life as a ball of gas and dust. Gravity pulls the gas and dust into a spere. As the sphere becomes denser, it gets hotter and eventually reaches temperature of about 10,000,000 Celsius in its center. As hydrogen combines into helium, energy is released in a precess called neclear fusion.
The sun is composed of what?
mostly hydrogen and helium
What are the Sun's main atmospheric gases?
Hydrogen and helium. Mostly hydrogen.
The onset of which event marks the change of a protostar into a star?
the nuclear fusion of hydrogen into helium
The onset of which event marks the change of a protostar into a star-?
The nuclear fusion of hydrogen into helium
What are all the gases in a protostar?
Mostly hydrogen (with some helium, deuterium, and lithium). Other elements (all other elements) are added as the date of formation of the protostar comes closer to the current date.
Compare the elements in an early prostar and those in a young star formed star dust of older stars?
A protostar has 100% Hydrogen. A young star has a Helium core.
What are the two main elements found in the stars?
Hydrogen and helium
What are the symbols for hydrogen and helium?
The chemical symbol for helium is "He."
Hydrogen and helium formulas?
Hydrogen is H2. Helium is He.
What is the difference between a star and a protostar?
A "Star" can be anything from the beginning of a stars life (Protostar) up until it has died and only it's remnants remain (White dwarf, neutron star, black hole). However, for this question, we will assume that a "star" is when it is fusing hydrogen into helium, which is what most stars we see, including the Sun are doing. A protostar is the first stage in a stars life (See related question) whereas a "star" in this question is when there is enough pressure and thus temperature for the star to star fusing hydrogen into helium and it joins the main sequence - thus becoming a star (See related question)
What is a star called when it glows but has not begun to fuse hydrogen?
Protostar
The two elements most abundant in the universe are?
Hydrogen and helium are the two most abundant elements in the universe.
How is a protostar different from a star?
A star begins its life as a ball of gas and dust. Gravity pulls the gas and dust into a spere. As the sphere becomes denser, it gets hotter and eventually reaches temperature of about 10,000,000 Celsius in its center. As hydrogen combines into helium, energy is released in a precess called neclear fusion.
Which is lighter - helium or hydrogen?
Hydrogen is lighter than Helium.
