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The ability of the sun to fuse hydrogen is dependent on a critical temperature and pressure. The only place that the sun is fusing is deep within its interior where the pressure is high enough. As nuclear fusing takes place the result is Helium gas, four times denser than Hydrogen. Being heavier the Helium collects in the sun's core. Also because it is denser it produces a greater gravitational field (gravity is dependent on mass) so the pressure inside the sun increases and the effective radius within which hydrogen fusion can now take place also increases. This means that the sun can fuse more hydrogen in the same amount of time so it gets hotter. And when things get hotter they expand.

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Q: Explain why the sun will increase in size as it begins to burn off its fuel?
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Continue Learning about Astronomy

Rockets need to have what in order to burn fuel?

They need petroleum in order to burn the fuel.


How does rocket fuel burn in space without oxygen?

The rocket carries its own supply of oxygen with which to burn the fuel.


How can a rocket burn its fuel in space?

Since there is no air in space, the spacecraft must bring an 'oxidizer' with it into space. That oxidizer mixes with the fuel, providing the oxygen needed for it to burn, and it burns..


Will the star ever run out of fuel?

Yes, all stars run on a limited suppliy of fuel - mainly hydrogen. Some stars burn it very quickly but reach high temperatures, while other lower mass stars burn their fuel more slowly, lasting for longer, but burn at cooler temperatures.


Can you burn fossil fuels on the moon?

to burn any material, not only fossil fuel, we need three things: 1. Fuel (any material that can be burned, ex: fossil fuel, wood, paper, etc) 2. Ignition (high temperature, or fire sparks) 3. Air and now, if you want to burn fossil fuel on the moon you also need these three factors.. the answer is : NO, because there is no air on the moon ( if there is, it's just in a very small volume and can't be used to burn fossil fuel) ~ ANSWER 2.0 BY RUSSIANS 1)there is no fossil fuel on the moon 2)there no oxygen on the moon however if you bring your own, like the FUEL AND OXIDIZER for rocket engines of American space craft fossil fuel will burn just fine. i believe the fuel used was hydrogen witch is non petroleum so technically it was not fossil fuel. but never the less it was fire in vacuum.

Related questions

Will a fuel cooler increase fuel efficiency?

It is possible that a fuel cooler will increase fuel efficiency. The hotter a fuel burns, the faster it will burn away.


Explain what heat engines do and name the process in which they use to burn fuel?

Combustion


How do you increase gas mileage on a Subaru impreza?

There are show great things you can use. One of them is to use Fuel Infusion. It helps your engine burn fuel more efficiently. Most cars burn their fuel at 93-97% efficiency.


How do fires burn?

Fires involve chemical reactions. They generally require some kind of heat to begin the chemical reaction, and the reaction begins and releases heat which keeps it going. Like when we burn wood or paper. Heat the fuel sufficiently, it begins to burn and use oxygen out of the air, and it continues until it is cooled, smothered, or runs out of fuel. There are more "exotic" fires, but that's the basic idea in a nutshell.


What exactly is a fuel energizer?

fuel energizer is special design of magnets around a fuel pipe just before carburettor or fuel injector which will ionize the fuel to get the positive charge on it to get adhere to oxygen to burn completely and increase the milelage of your vehicle


Why has fossil fuel use increase?

Human beings use machines to make life easyand machines burn fossil fules.


Is it a law that factories cant burn fuel?

no, everyone burns fuel by turning on the stove you burn fuel


What is a knock sensor?

A knock sensor is a device that senses detonation. Detonation occurs in the engine when the fuel begins to burn prematurely; it can cause substantial damage to the engine.


What is knock sensor?

A knock sensor is a device that senses detonation. Detonation occurs in the engine when the fuel begins to burn prematurely; it can cause substantial damage to the engine.


Rockets need to have what in order to burn fuel?

They need petroleum in order to burn the fuel.


how to increase core body temperature?

Your body needs fuel to burn to keep your core body temperature up, especially when it's cold outside


What is the hourly fuel burn rate for a 747-400?

the Hourly fuel burn rate varies depending on altitude, speed, and amount of fuel left. On average, it will burn 20,000 lbs of fuel per hour.