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Quite simply, the Sun will eventually run out of fuel.

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12y ago
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Q: Why do scientists believe in 6 billion years the sun will burn out?
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Related questions

How much longer do scientists think the sun will exist for?

The sun is middle aged, it has burned for about 6 billion years and will burn for about 6 billion more years.


For how long will the sun last?

The Sun has been living for approximately 4.57 billion years , and is expected to last for roughly 5 billion more, as it's lifespan is about 10 billion years. :D


Why doesn't the sun burn out?

The sun actually will burn out, but it won't be for about 5 billion years.


Will the sun be around in the future?

Well the sun has been around for 4.5 billion years and most scientists think that it should be around for another 4 billion years than it will most likely burn out, like most stars do.


How old is the sun and when will it burn out?

the sun is 5 billion years old it will burn out in 5 billion more


What is the Expected lifetime of the sun?

Much longer than yours so don't worry Around 9 billion years remain. When it becomes a red giant the earth will likely be destroyed as will Mercury and venus etc


What happened to Big Star?

IT will burn out after 50 billion years!


When is your sun going to burn out?

Probably not for at least 5 billion years.


What happens to really big star?

IT will burn out after 50 billion years!


In exactly how many years will the sun burn out and exactly?

listen, no one knows exactly but it will burn up in a million 2 billion years


Why doesn't the sun burn other planets?

tyhe sun actually will not burn out but it not last for 5 billion years


How long will it take for the sun to use up all of its energy?

the sun will take atleast 10 billion years to completely burn up. It is almost halfway through the "dying" stage, some scientists say. The Earth may die before the sun runs out of energy and light.