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Astrophysics
Astrophysics is the scientific discipline concerned with the events that are taking place on the grandest of stages; the universe. Questions about the formation and evolution of the planets, solar systems, stars, and galaxies found within the universe, as well as questions regarding black holes, cosmic rays, particle and nuclear astrophysics, nucleosynthesis, and magnetohydrodynamics should be directed here.
1,304 Questions
How are black holes classified?
They can be classified according to whether they rotate or not; their electrical charge; but especially their mass.
Which types of celestial body emits x rays?
There are plenty of celestial bodies that emit xrays - while others scatter, reflect, or alter the energy of electromagnetic radiation into the x-ray range. Sources that emit x-rays include pulsars or neutron stars, the accretion disks of black holes, stars - particularly ones with certain types of companions, stellar remnants such as from supernovae, entire galaxies (with and without active nuclei) and to some extent, even the universe as a whole; though some of this is generally attributed to mechanisms which heat gas. There are even x-ray sources within the solar system, including the Moon, since not all of its observed x-ray emission is simply reflected from the Sun.
What happens if you go into a black hole and does it lead you to another world with life?
No form of life we know, or can imagine for that matter, would survive a fall into a black hole.
no one entering returned
What happens if a white hole gets sucked into a black hole?
A white hole (assuming they actually exist) is simply a small black hole, so nothing very spectacular would happen. The black hole would just get very slightly more massive (well, considerably more massive on a "how many ounces is that" scale; not so much on a "how many solar masses is that" scale).
Why do x-rays leave a black hole?
If matter falls into a black hole, it will be accelerated so much that it will emit x-rays. These are emitted before the matter reaches the event horizon, that is, before it is "inside" the black hole. Any x-rays emitted after the matter passes the event horizon will stay inside.
What is the end state of a star?
The general term for the end state of a star is a stellar remnant - which might take one of several forms depending mostly on the mass of the star. A typical main sequence star below about ten solar masses might end its life as a white dwarf and cool to the brown stage and (eventually) become a black dwarf. Heavier stars may shed much of their outer envelope into a planetary nebula, and their remnant might be a neutron star (or pulsar); even heavier and it might become a more exotic form of collapsed matter, or become a black hole - these remnants believed to be preceded by the violent explosion of the massive star in a supernova.
In all these cases, the stellar furnace is out, but the mass lives on. Interestingly enough, because of the presence of elements in our sun in trace amounts that aren't formed by ordinary stellar fusion processes, likely it is "second generation" or more - elements having accumulated into a new star from previous supernova explosions thought to be the only means of creation of elements heavier than iron. The same is true of terrestrial matter - we are believed to be made of material which was once present inside a star.
Is there a star called the golden star?
Arcturus, one of the brightest stars seen from earth, is sometimes called The Golden Star. Its name comes from Ancient Greek ????????? (Arktouros) and means "Guardian of the Bear," referring to its position next to the Greater (Ursa Major) and Lesser (Ursa Minor) Bears constellations.
Could a mini black hole be used as an energy source?
Yes, a mini black hole could potentially be used as an energy source, although it would be extremely difficult to position and manage. Professor Stephen Hawking pointed out once that a black hole the mass of a mountain would give off x-rays and gamma rays at a rate of about ten million megawatts, enough to power the Earth's electricity needs. Another system called the Penrose process could exploit energy of the angular momentum of the black hole to do work on infalling matter by accelerating it which could then be harnessed as a power source - eventually causing the black hole to lose mass and rotational inertia, and harvesting about a fifth of the black hole's mass as energy. Other theoretical propositions exist which could harness Hawking radiation near the event horizon; or exploiting the energy of waste matter by collecting it at the polar relativistic jets; or harnessing a charged black hole through current induction, or various other methods.
What is the gravitational force of the black hole?
The gravitational force of black hole is unlimited.
Michael Stern Hart was an American author who was best known as the inventor of the electronic book and the founder of Project Gutenberg, the first project to make electronic books freely available via the Internet.
Leon Michael "Mike" Hart is an American football coach and former player.
Michael H. Hart is an American astrophysicist and author, most notable of The 100: A Ranking of the Most Influential Persons in History.
What is the probability of a star becoming a black hole?
Well the probability of a star becoming a black hole is quite simple .It depends on the mass of the former star .If the former star had low mass then it would become a white dwarf at the end of its evolutionary stages .But if the Star had high mass then it would detonate which is called a supernova .After the super nova then it would do either two things it would turn into a pulsar (spinning neutron star) .If it went the other way then the gravity on the super nova will collapse into the singularity and create infinite density and then the remains is called a black hole.
Gods creation (THE UNIVERSE)is unto a picture, it has similarities and patterns. It is as a picture painted by an artist. One looks upon paintings of different artists and can see these similarities and patterns, which tells the trained eye, it was painted by the same artist.In this case of the universe, God is the artist.
Man seeing these patterns, and not willing to accept them as gods, uses the evolution to explain them. Otherwise the question where these patterns came from would remain unanswered, omitting god.
Therefore seeing these patterns and not being able to explain them, keeping god out of the picture, He uses evolution , as mans answer.
But an artist does not have to repaint picture one to get picture two, yet man seeing these patterns, and not accepting creation, states picture one evolved into picture two, to make the answer acceptable within the laws of the universe.
Another example, lets take the word nature.It is used as mans way to replace god. Rules and regulations that govern the universe, that man in all his knowledge cannot change or even can understand. If this is so, knowing a power greater then we exists, and controls these laws and regulations, its the proof of a living god.
More proof of this, Enstein, his theories proven, Matter per say, in our knowledge, cannot be created or destroyed. Matter can be converted to energy, and energy into matter, but the total amount of matter and energy in the universe remains the same.
If you take a match,and burn it, and were able to capture the light, heat, smoke, and ash, it would equal what you started with. Knowing this and looking to Enstein E=mc2.
Energy=matter X speed of light squared.This equation E=MC2,is used to measure the energy formed when matter is converted into energy. It proves a creation or start. This is proven in the making of the A and H bombs.This proven fact shows matter cannot be destroyed only changed or converted in mans knowledge, according to the rules as ser forth by god for man.
Using plutonium to make a bomb,the splitting of this atom to make 2 other atoms of lesser atomic weight, the difference converted into energy according to e=mc2.
Using heavy hydrogen and fusion, two heavy hydrogen atoms (H2) into helium (H3), we make the h bomb, the lost proton converted into engery according to e=mc2.
If this is proven, and man measures quantums of energy and matter, how can we state as we do, that is, those not believing in creation and god, the beginning just came into being, and evolution took care of the rest.
If you take the smallest breakdown of an atom, it is as complex as man himself.
How can one accept all matter and energy was there at the beginning. We in our knowledge know man cannot create or destroy matter.The big bang theory for the universe therefore is wrong. Where did the matter come from, that exploded.
Now that we have proven that man and so called evolution did not cause what is, to exist. This is what happened. God created matter, and created energy or light.
The bible states in the beginning god made the heavens and the earth, and he said let there be light. Therefore a creation occurred, and this universe is gods handywork, and we are the product of his creation . What came first is unimportant, for if one has the knowledge to create matter, one can create energy since they are interchangeable. He does not need one to change into the other,as man does, only man is bound by gods rules, god is not. He created these rules.The universe and Man are bound by these laws,proof of a living god. Man cannot restrict gods creation and power.
AnswerThere is an emerging collection of theories called "Membrane Theory". There are certain properties of gravity that are difficult to explain. As it turns out, these properties can easily be explained if we fit it mathematically into the current 11-dimension structure theorized for the universe. We know that there are many dimensions beyond the obvious 3, and that they exist at very small scale on the quantum level. This structure has given rise to Membrane Theory, which holds that our universe is actually a membrane in the 11th dimension. It is theorized that possibly, our universe came into being as a result of the collision of two already existing membranes in the 11th dimension. The collision was in effect our Big Bang. This theory opens up wonderful possibilities about all kinds of things happening before our humdrum Big Bang. From a Buddhist Perspective:The Big Bang Theory is posited by an array of qualified scientists upon discovery based around "theoretical" approaches in physics. It certainly has plausibility considering it's such a talked about phenomenon between scientists and people of religious backround. In the grand scheme of things the universe is comprised of matter and energy. If we were to to break down matter to it's most infintesimal form one would encounter particles introducing the concept of quantum mechanics. The principles of quantum mechanics evolve around the concept that particles move freely under any given situation, meaning one cannot measure or perhaps predict the movement of a particle under any given circumstance insofar as saying the most intricate mathematical equation could only posit probability not predictability. Therefore if man can't even predict the movement of a particle how is it possible to predict the formation of an entire universe? Questions such as What caused the "Big Bang Theory"? What occurred before the "Big Bang Theory" certainly are important questions that hold merit yet science for the most part without generalizing turns it's cheek to answer such relevant questions pertaining to the formation of the universe. I feel the right approach to solving these metaphysical questions starts with an open dialouge between scientists and spiritualists. Speaking on behalf of Buddhists and Hindus we're more than happy to discuss these very issues with secularists the only problem is secularists without generalizing, but based upon my own personal experiences communicating with them are closed-off from even considering such a topic of discussion.How do you put astrophysics in a sentence?
Astrophysics is an area of science that studies the universe, including stars and other celestial bodies in particular.
What is a miniture black hole?
A miniature black hole is what forms when atoms smash at a rate to form a mini black hole, gobbling many protons and neurons and other extremely tiny things. Don't worry, they still don't "eat" very much. They also don't last very long.
What is the absolute magnitude for a black hole?
"Absolute magnitude" talks about the intensity of light radiating from a source.
The black hole is black because no light radiates from it. So you'd have to say
that its magnitude ... visual, absolute, intrinsic, or any other kind of magnitude ...
is infinite. (Magnitude numbers are higher for dimmer sources.)
By reading a lot on the subject. You may want to get an introductory book on astronomy; or look for online resources about the same topic. For example, the Wikipedia article on "Star" could be a starting point.
How big would the Earth have to be to collapse into a black hole?
About 30 kilometers in diameter. This refers to the "event horizon". Actually this diameter is directly proportional to the mass: at twice the mass, a black hole will have twice the diameter.
Stellar black holes have been found with estimated diameters from about 20 kilometers upwards.
Which property of normal matter ceases to exist in a black hole?
More than one property of normal matter would cease to exist once it fell into a black hole. In black holes the matter is shown to be concentrated in the singularity in its center, in a point of no linear dimensions (or only one, length, for a spinning black hole with a ring-shaped singularity) - by contrast, all normal matter occupies some space in three linear dimensions. Normal matter has a finite (nonzero) density, but in a black hole singularity density seems to be infinite. Outside a black hole, time passes for matter; in the singularity, time has stopped. Some less apparent notional properties of matter would also cease to exist - for example that all matter exerts a vapor pressure (there would be no chance for matter to escape the singularity), for information to be obtained regarding the matter (no information can escape, the matter would not be observable hidden behind the event horizon), that it could possess chemical properties or have sub-atomic structure (the singularity does not allow for bonds or internal structures since degeneracy pressure was insufficient to prevent absolute collapse), and so forth.
Comments: This is a difficult question, but I would point out that you need to specify where the matter is within the Black Hole. It could be anywhere inside the "event horizon", including the "singularity".
What are the black holes that are close to earth?
pluto...but don't put your trust on this question cause i don;t think its a planet anymore... =)
The nearest black holes we know about are light-years away, so it makes hardly any difference what planet you are on.
What makes Cygnus X-1 a good black-hole candidate?
Cygnus x-1, which is found within the Swan Cygnus constellation, is a binary star system and one of the brightest sources of x-rays in the sky. Data collected from this system indicates that there is a compact "object" that is 9 solar masses. As well, its brightness has been observed to be continually changing, which is a characteristic of a blackhole, and simply cannot be otherwise explained.
What is the worship of celestial bodies called?
It is called Idolatry "The Christianity view of idolatry may be divided into two general categories. The Catholic and Orthodoxy view (not necessary limited to the Eastern Orthodox or Oriental Orthodox communion, and sometimes further complicated when you add Anglicanism and Methodism into the equation) and the fundamentalist-Christianity view. The puritan protestantism groups adopted a similar view to Islam, denouncing all forms of religious objects whether in three dimensional or two dimensional form. The problem springs from differences in interpretation of the Ten Commandments. "You shall have no other gods before me. You shall not make for yourself a graven image, or any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth; you shall not bow down to them or serve them; for I the Lord your God am a jealous God, visiting the iniquity of the fathers upon the children to the third and the fourth generation of those who hate me, but showing steadfast love to thousands of those who love me and keep my commandments." (RSV Exodus 20:3-6). "From Answers.com
Why don't we get sucked into the black hole in the middle of our galaxy?
We are strongly influenced by the gravity of the supermassive black hole in our Milky Way, (combined with the over-all gravity of the rest of the galactic material) because our solar system is orbiting around it. But we are very far from the event horizon. The event horizon is the distance at which there is no force capable of preventing collapse of an object into the hole itself.
Is a person with btech in earth science can become an astrophysicist?
With only a bachelor's degree, it is unlikely that you would get any kind of good paying job in astrophysics. To get a good job, you need at least a masters degree, but preferably a doctorate. In fact, all astrophysicists I've heard of have doctorates.
Stars are formed from interstellar clouds because of?
Because of gravity. Only gravity can pull large clouds together with enough force to overcome gas pressure.
