Zahid Akon
first i know light have no mass or weight.and i read that when a light goes in black hole it dont come for gravity so i knewed that a light ray have no mass or weight and if something dont have mass or weight it dont have any effect in gravity so light dont have a gravity effect because it is a power so my question is why all the other says when the light goes in black hole it gets sucked or traped by its gravity power.but why.it shouldent be happening am i right?
and what is a blackhole and a wormhole?(please say it in easy english cause iam only 14)
and do u think that if a planet have oxyzen and water can there be a life?
what is more faster than light?
well we know oxyzen is needed for fire to be burn do u think there is oxyzen in sun if no how can it be burning?
if you like my questions you can give me a star.
and take care.
Answer
>first i know light have no mass or weight.
That isn't exactly correct. Light has no REST mass, true. However, special relativity dictates that things gain mass as they move at higher speeds, and light particles (photons) do effectively have mass because they are moving. No, it doesn't make much sense, but most of quantum mechanics is like that; scientists are still busy working out exactly how these things work. At any rate, the fact remains that light does have mass for all practical purposes. You can read more about this here:
http://math.ucr.edu/home/baez/physics/Relativity/SR/light_mass.html
http://musr.physics.ubc.ca/~jess/p200/emc2/node11.html
>and what is a blackhole and a wormhole?
A black hole is an object which has so much gravity that light cannot escape from it. Such objects are formed in the explosions of giant stars, where the pressure and density reach the point where this kind of collapse can happen. A 'true black hole' is a gravitational singularity in space, a place where there is an infinitesimally (in other words, infinitely small) point with infinite gravity (although this gravity is finite for every finite distance outside the black hole). These 'true black holes' do not yet exist in our universe, because they require infinite time in order to complete their collapse. You can read more about them here:
http://en.wikipedia.org/wiki/Black_hole
Wormholes, on the other hand, are unlike black holes in that there is not yet any scientific evidence that they exist. They are areas where space has been warped into itself, forming a loop from one place to another. Einstein's general relativity theory presented the space of our universe as a flat sheet something like a trampoline, where gravity forms dents in the sheet just as a person standing on a trampoline forms a depression where they are standing. The deeper the depression an object makes, the more gravity the object has; black holes as we observe them must have a depression in space of at least a certain depth, and true black holes have a depression infinitely deep. Wormholes, on the other hand, are what you have if you get two depressions, push them towards each other, and attach the ends together into a sort of doughnut. Here is a graphical representation of a wormhole:
http://media.radiosai.org/Journals/Vol_05/01MAY07/images/FeatureArticles/SFI/worm-hole.jpg
The fourth one in the list is a standard representation of a wormhole, while the second and third are other ways of showing a wormhole, and the first image is a representation of a black hole. You can read more about wormholes here:
http://en.wikipedia.org/wiki/Wormhole
>and do u think that if a planet have oxyzen and water can there be a life?
Yes. In fact, molecular oxygen may not even be necessary. It is likely that life on Earth began in an environment with very little molecular oxygen, and the vast amoutns of it we have now only exist due to photosynthesis (which is a process conducted by living things). It is highly likely that other planets exist in the Universe where life, using water and oxygen as well as carbon, has evolved separately from life on Earth. You can read more about extraterrestrial life and the theories involved here:
http://en.wikipedia.org/wiki/Extraterrestrial_life
>what is more faster than light?
Superluminal (faster than light) travel refers to, well, moving faster than the speed of light. Einstein's special relativity theory states that it is not possible for us to go faster than light (or, at the very least, that it would require infinite energy, which is the same thing for all practical purposes). Like wormholes, faster than light travel is currently only a science fiction device; scientists don't know of any real principles that could allow it to be done artificially in any way. Superluminal travel is a common solution used in science fiction to bypass certain limitations on actual space travel. For example, under known physics there is no way for a spaceship to travel from the Earth to Proxima Centauri (the closest start to Earth that isn't the sun) in less than about four and a half years according to the time that passes on Earth. Similarly, if we sent a signal to someone at Proxima Centauri, it would take us no less than nine years to receive a reply. This is a rather depressing timeframe, so in order to make their universes a little faster and more exciting, science fiction writers often resort to various 'hyperspace drives' or 'translight drives' to move things faster than light. You can read more about it here:
http://en.wikipedia.org/wiki/Faster-than-light
>well we know oxyzen is needed for fire to be burn do u think there is oxyzen in sun if no how can it be burning?
The Sun is not burning in the same sense that a fire burns. Fires on Earth are chemical reactions, which continue because certain molecules are fusing with oxygen to release energy. Even back in the 1800s, it was already determined that the Sun could not be a standard chemical reaction, as it should have gone out after only a few thousand years (it has been going for about four and a half BILLION years in the real world). Instead, the Sun is using a different kind of reaction, nuclear fusion. This is a process in which hydrogen atoms are fused with each other to form helium atoms, which releases a vast amount of energy, much more than the same hydrogen atoms could do by reacting with oxygen. Now, as a matter of fact there IS some amount of oxygen in the Sun, however the reason it shines is only because it has a fusion reaction going. This fusion is basically the same thing which is used in advanced nuclear weapons, and within another few decades it is likely that we will develop ways of keeping fusion reactions going inside laboratories in order to generate electrical power. You can read more about this here:
http://en.wikipedia.org/wiki/Nuclear_fusion
http://en.wikipedia.org/wiki/Sun#Core
>first i know light have no mass or weight.
That isn't exactly correct. Light has no REST mass, true. However, special relativity dictates that things gain mass as they move at higher speeds, and light particles (photons) do effectively have mass because they are moving. No, it doesn't make much sense, but most of quantum mechanics is like that; scientists are still busy working out exactly how these things work. At any rate, the fact remains that light does have mass for all practical purposes. You can read more about this here:
http://math.ucr.edu/home/baez/physics/Relativity/SR/light_mass.html
http://musr.physics.ubc.ca/~jess/p200/emc2/node11.html
>and what is a blackhole and a wormhole?
A black hole is an object which has so much gravity that light cannot escape from it. Such objects are formed in the explosions of giant stars, where the pressure and density reach the point where this kind of collapse can happen. A 'true black hole' is a gravitational singularity in space, a place where there is an infinitesimally (in other words, infinitely small) point with infinite gravity (although this gravity is finite for every finite distance outside the black hole). These 'true black holes' do not yet exist in our universe, because they require infinite time in order to complete their collapse. You can read more about them here:
http://en.wikipedia.org/wiki/Black_hole
Wormholes, on the other hand, are unlike black holes in that there is not yet any scientific evidence that they exist. They are areas where space has been warped into itself, forming a loop from one place to another. Einstein's general relativity theory presented the space of our universe as a flat sheet something like a trampoline, where gravity forms dents in the sheet just as a person standing on a trampoline forms a depression where they are standing. The deeper the depression an object makes, the more gravity the object has; black holes as we observe them must have a depression in space of at least a certain depth, and true black holes have a depression infinitely deep. Wormholes, on the other hand, are what you have if you get two depressions, push them towards each other, and attach the ends together into a sort of doughnut. Here is a graphical representation of a wormhole:
http://media.radiosai.org/Journals/Vol_05/01MAY07/images/FeatureArticles/SFI/worm-hole.jpg
The fourth one in the list is a standard representation of a wormhole, while the second and third are other ways of showing a wormhole, and the first image is a representation of a black hole. You can read more about wormholes here:
http://en.wikipedia.org/wiki/Wormhole
>and do u think that if a planet have oxyzen and water can there be a life?
Yes. In fact, molecular oxygen may not even be necessary. It is likely that life on Earth began in an environment with very little molecular oxygen, and the vast amoutns of it we have now only exist due to photosynthesis (which is a process conducted by living things). It is highly likely that other planets exist in the Universe where life, using water and oxygen as well as carbon, has evolved separately from life on Earth. You can read more about extraterrestrial life and the theories involved here:
http://en.wikipedia.org/wiki/Extraterrestrial_life
>what is more faster than light?
Superluminal (faster than light) travel refers to, well, moving faster than the speed of light. Einstein's special relativity theory states that it is not possible for us to go faster than light (or, at the very least, that it would require infinite energy, which is the same thing for all practical purposes). Like wormholes, faster than light travel is currently only a science fiction device; scientists don't know of any real principles that could allow it to be done artificially in any way. Superluminal travel is a common solution used in science fiction to bypass certain limitations on actual space travel. For example, under known physics there is no way for a spaceship to travel from the Earth to Proxima Centauri (the closest start to Earth that isn't the sun) in less than about four and a half years according to the time that passes on Earth. Similarly, if we sent a signal to someone at Proxima Centauri, it would take us no less than nine years to receive a reply. This is a rather depressing timeframe, so in order to make their universes a little faster and more exciting, science fiction writers often resort to various 'hyperspace drives' or 'translight drives' to move things faster than light. You can read more about it here:
http://en.wikipedia.org/wiki/Faster-than-light
>well we know oxyzen is needed for fire to be burn do u think there is oxyzen in sun if no how can it be burning?
The Sun is not burning in the same sense that a fire burns. Fires on Earth are chemical reactions, which continue because certain molecules are fusing with oxygen to release energy. Even back in the 1800s, it was already determined that the Sun could not be a standard chemical reaction, as it should have gone out after only a few thousand years (it has been going for about four and a half BILLION years in the real world). Instead, the Sun is using a different kind of reaction, nuclear fusion. This is a process in which hydrogen atoms are fused with each other to form helium atoms, which releases a vast amount of energy, much more than the same hydrogen atoms could do by reacting with oxygen. Now, as a matter of fact there IS some amount of oxygen in the Sun, however the reason it shines is only because it has a fusion reaction going. This fusion is basically the same thing which is used in advanced nuclear weapons, and within another few decades it is likely that we will develop ways of keeping fusion reactions going inside laboratories in order to generate electrical power. You can read more about this here:
http://en.wikipedia.org/wiki/Nuclear_fusion
http://en.wikipedia.org/wiki/Sun#Core
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