why did the stars never turn off? what they are made of ?

Question

pleasee i need a great answer with really specfic details and if their is a web that is helpful i will need . thanks

Answer 1

Made of gasses...

Answer 2

Star get their energy from nuclear fusion. This is where two lighter elements (hydrogen being the most common) are fused under tremendous pressure and heat. The reaction produces a heavier element, and the leftover energy in the reaction is what we see.

Stars can continue to fuse elements up to Iron for energy. After Iron, the fusion reaction produces a net loss of energy.

As stars like our sun age, the begin fusing heavier and heavier elements. Eventually, a star burns through all of its fuel.

Depending on how much mass the star has, a star will either go out quitely (becoming a brown dwarf or similar stellar remnant), explode, or collapse into a black hole.

You may have heard that we are made of star stuff. This is true, as every element heavier than hydrogen was produced in some sort fusion reaction.

~X~

Answer 3

A star begins as a collapsing cloud of material that is composed primarily of hydrogen along with some helium and heavier trace elements. Once the stellar core is sufficiently dense, some of the hydrogen is steadily converted into helium through the process of nuclear fusion. The remainder of the star's interior carries energy away from the core through a combination of radiation and convective processes. These processes keep the star from collapsing upon itself and the energy generates a stellar wind at the surface and radiation into outer space.[1]

Once the hydrogen fuel at the core is exhausted, a star of at least 0.4 times the mass of the Sun[2] expands to become a red giant, fusing heavier elements at the core, or in shells around the core. It then evolves into a degenerate form, recycling a portion of the matter into the interstellar environment where it will form a new generation of stars with a higher proportion of heavy elements.[3]

Answer 4

The stars are an example of a thermal nuclear reaction called fusion. They are constantly fusing hydrogen into helium - and the "extra" mass that is left over is converted to energy. This energy (the source of energy from our sun) is released in the form of light, radiation and heat.

And, for what it's worth, they do "turn off" - when they exhaust all of their "fuel" - this is when a star burns out or collapses in on itself due to gravity and the loss of the thermal energy to oppose it and keep it stable. Not to worry, though, our sun is comparatively young and won't run out of fuel for several million years to come.

Answer 5

Stars generate energy from the continual fusion of smaller atoms into larger ones. In the case of our sun, the fusion is of hydrogen into helium.

They don't "turn off" as the fusion is continuous.

Answer 6

They do turn off. A star is just a big fire. Eventually it will run out of fuel and go out. There are stars disappearing all the time. In many millions of years, our sun will burn out. They are made of hydrogen which burns.

Answer 7

some of them do and have burned out, often the light reaching us is years old. Think light years. Think of pencils of light traveling toward your eyes, the light can be very very old. The star might have already burned out and the light still is there traveling.

They are mostly Hydrogen and Helium burning I think.

Answer 8

Stars are powered by hydrogen. Space is full of the stuff. Gravity pulls it in.

Some stars do turn off. They use up all the available hydrogen in their region.

Answer 9

its made out of hot gas... compressed tightly and they are exposed to sun 24/7 but some stars .. they are called variable stars.. its like " invisble star" they are stars that have componds like regular one but " bounces light off them" (rejects) dont adapt to the radioactive moletucles of sun.. stars do turn off... sometimes when they are blocked by planets.. this is common...

Answer 10

Actually between the gasses they are made of and the reflecting the sun's light they just look like they are on plus they spinn so they are very hot

Answer 11

Personally I think they DO turn off, it's just that no one's been able to reach the switches :)