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Why must the suns rate of fusion gradually rise over billions of years?
Wiki User
∙ 12y ago
Fusion reactions decrease the overall number of particles in the core, causing the core to shrink, converting gravitational potential energy into thermal energy, and increasing the rate of fusion.
Wiki User
∙ 12y ago
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What is the critical temperature the core must reach for a star to shine by fusion?
about 10500-11000k is when fusion commences which creates the shining of the star
How does the sun produce heat and light energy?
Stars must be formed by the agglomeration of material under gravitational forces. When the mass of material is high enough the pressure in the mass will get to the point where it causes enough heat to start a nuclear fusion reaction, which then goes on producing heat for billions of years.
How big does a planet have to be to be a planet?
To be considered a planet, an object must be massive enough to be rounded into a spheroid by its own mass but not massive enough to cause thermonuclear fusion. Additionally, a planet must be orbiting a star or what used to be a star, and it must not be part of a disk of similar objects, like a Kuiper belt object.
What evidence is there to suggest that the sun was formed from material produced when an earlier star exploded?
This was on yahoo answers (http://answers.yahoo.com/question/index?qid=20071228163233AAI0621) and explains quite well why our sun is second generation at least: The only elements that would have been formed from the big bang are hydrogen, helium, and perhaps trace amounts of lithium. Elements up to iron can be produced in a star by nuclear fusion. (Heavier elements require more energy to start the fusion than is released in the fusion reaction--i.e. energy is LOST. Therefore, only elements up to iron are formed by nuclear fusion.) In a star like our sun, there is not enough mass to create the pressure and heat needed for even the fusion into iron. Our sun will produce metals only up to carbon and oxygen. Any metals heaver than iron could only be produced in a supernova. (Just a note, astronomers and astrophysics use the term "metal" to mean any element heaver than hydrogen or helium). The fact that our sun contains trace amounts of iron and heavier metals means it must have been there when it formed, since these cannot be formed by the nuclear fusion within our sun. Since first generation stars would only contain hydrogen, helium, and trace amounts of lithium from the big bang, our sun is not a first generation. This makes sense since our sun is only around 5 billion years old and the universe is about 16 billion (opinion varies from 11 to 20 billion, but 16 is right in there and generally accepted). That leaves at least 10 billion year for things to have happen before our sun formed: That is a lot of years for other stars to have formed and died, recycling some of its mass back into the universe and our sun. Since the life cycle of very large stars could be as little as 100 million years to supernova stage, the sun could conceivably be many generations along. Anyway you look at it, it is definitely AT LEAST second generation.
Where are the heaviest nuclei of all formed?
Elements heavier than iron are formed through the fusion reaction in stars when a supernova occurs. The lighter elements up through iron are formed in "regular" stellar fusion, and this is what powers most stars throughout their lives. A lot of energy is created in the fusion reactions, and this is why stars "burn" the way they do. But after iron, fusion switches from exothermic to endothermic. That means energy must be put into the fusion reaction to create these heavier elements, and only when a super abundance of energy is available, like during the collapse of a star in a supernova, is there sufficient energy to drive those fusion reactions. All the trans-iron elements up through uranium are created in the supernova.
Can you use fusion recovery after i use dark fusion?
Yes you can. Obviously Fusion Recovery must target a Polymerization, not Dark Fusion.
What causes Orion's belt to be nearly a straight line even though those 3 stars must be billions of light years apart?
Your perspective when viewing it.
What do you mean by fusion barrier in nuclear physics?
A fusion barrier refers to the repulsive charge between two nuclei that must be overcome to initiate fusion.
Can you summon a elemental hero neos fusion by sending cards from your hand?
No, the 'Neos' fusion monsters state how they must be summoned on their cards. The monsters must be returned from field to deck, you can't summon them like regular Fusion monsters using a fusion card and components in hand.
Replacing the regulator on a 2006 Ford Fusion how do I replace the actuator on a Ford Fusion 2006 with power windows?
To replace the regulator on a 2006 Ford Fusion, you must engage a mechanic.
What is the literary device for the truth must dazzle gradually?
metaphor
What is the critical temperature the core must reach for a star to shine by fusion?
about 10500-11000k is when fusion commences which creates the shining of the star
What literacy device is used in the truth must dazzle gradually?
metaphor
If nuclear fusion is so effective for powering stars why isn't it pratical for generating electricity in power plants?
Nuclear fusion in stars is quite slow; typically the star exhausts its entire fuel supply in millions, billions, or even trillions of years. To make it practical on Earth, temperatures and pressures must be achieved that are quite a bit higher than those in the cores of stars. But even the pressures and temperatures in the cores of stars are hard to achieve - we are talking about temperatures of several million degrees, as well as very high pressures. For example, no regular container can withstand such a temperature.
Can you fuse gladiator beast from your hand?
No. Gladiator Beasts must be on the field to Contact Fuse. When the appropriate Fusion Materials are on the field, you can return them to your Deck to Fusion Summon the appropriate Gladiator Beast Fusion Monster.
Can you fuse monsters and summon the Fusion to the field in Yu-Gi-Oh?
If you activate polymorization, then yes you may fuse monsters in your hand, or on the field. You must also have the correct fusion monster in your fusion deck.
What problems must be overcome before fusion can be used to make energy?
The cells must be able to come together.
