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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
Why if you paint the inside of a box white and cut a hole to see inside it it appears black?
When light enters the box through the hole, it reflects off the white walls and is absorbed multiple times. This absorption reduces the intensity of the light reaching our eyes, making it appear black inside. The white walls scatter and diffuse the light, preventing it from bouncing back out the hole.
In the year 14000 earths axis will point?
Near, but not directly at, Vega. On the southern end, it will point... kinda nowhere in particular, much like it does now. (It will point about midway between two reasonably but not spectacularly bright stars, which is actually slightly better than the current situation.)
How do scientists find black holes?
by the x-rays they give out and the elliptical path of the stars circling around pure darkness.
There are a few ways. Since stars are so far, you can't observe the black hole directly, but you can observe the effects that the intense gravity from the black hole creates. For instance, a star with a black hole as its twin will behave as a star in a binary system, but you can't see the twin. So, you can assume that there is an invisible object nearby influencing the orbit of the twin.
Other ways are observing in different wavelengths - radio, infrared, ultraviolet and X-rays. If a black hole is consuming matter, it will often be active in these other wavelengths.
As black holes consume matter, they often throw out jets of highly accelerated matter and energy. These jets can be observed.
Thus, by combining the methods above (and others), you can determine where a black hole is.
Define a "hyper black hole".
A "Hyper Black Hole" is a massive "Black hole" thought to be created by many Black holes merging together. Theological Physics now believe that most galaxies, including our own Milky Way, have a "Hyper Black Hole" in the center
Most likely on the other side of a black hole is nothing,
It is probably like a blender and would destroy you as you entered.
chris: the concept of the movie black hole where its a wall that you could walk through and be in a different universe or time isn't true. it comes from a collapsed star so it is more sperecal. the question isn't whats on the other side but whats in the center. to answer that....no one knows but we think its full of things its sucked in but everything is crushed down by the impossibly high gravity.
Is a black hole a time machine?
From what I've heard and read about the black hole, I don't believe anyone can enter a black hole and live. From what I've read, it sounds like you would be compressed. It would be like being crushed slowly without being touched. I'm just wondering if we can travel underneath it. If so, then we would know for sure it leads to another galaxy. It would be proof that time and space can be "torn" to go somewhere else. (Aside: You are only compressed in the relativistic dimension of travel. As you approach the speed of light you get less thick to an outside observer. To you, the traveler, everything is just fine.)
Time doesn't really exist. It's merely a concept that exists because our lives eventually come to an end. Therefore we need to keep track of time. It is impossible to go back in time because time is only a mental concept. For time travel to be possible there would have to be an infinite number of realities all playing each moment simultaneously. Even so we would have no way of accessing these alternate realities. (Aside: Einstein says something about reality that is applicable to time as well. He stated "Reality is an illusion, albeit a persistent one. ...")
Time exists because without time, the six string theory comes crashing down to a halt if you look at it carefully. It is not just a mental concept because we die, it is as real as anything else, and just because some people can't look behind the wall doesn't make it any less real. If you could time travel, the most complicated way is to send everything in reverse. But, I would most likely use the void (using the theories of alternate realities, there must be a void. otherwise the similar energy would merge (the void is the space between universes of universal radiation, and like two magnets repelling each other, the void is made up of a repelling force), for it does not accommodate time in any sort; it just merely exists, and you could basically just go from one spot of the time-space in the universe to another.
But to answer the original question, no one can because you are just being crushed into a size which most people believe to be impossible to measure, so they call it infinitely small.
Research on all the science fiction standbys (time travel, teleportation, etc.) is regularly reported in "Nature" magazine, a stodgy, peer-reviewed, British science publication.
I have also found material prepared by Dr. Michio Kaku, co-founder of the string field theory who has written on the role of time travel in modern physics. In one of his discussions he states:
"However, before Einstein died, he was faced with an embarrassing problem. Einstein's neighbor at Princeton, Kurt Godel, perhaps the greatest mathematical logician of the past 500 years, found a new solution to Einstein's own equations which allowed for time travel! The "river of time" now had whirlpools in which time could wrap itself into a circle. Godel's solution was quite ingenious: it postulated a universe filled with a rotating fluid. Anyone walking along the direction of rotation would find themselves back at the starting point, but backwards in time!"
"In his memoirs, Einstein wrote that he was disturbed that his equations contained solutions that allowed for time travel. But he finally concluded: the universe does not rotate, it expands (i.e. as in the Big Bang theory) and hence Godel's solution could be thrown out for "physical reasons." (Apparently, if the Big Bang was rotating, then time travel would be possible throughout the universe!)."
"Then, in 1963, Roy Kerr, a New Zealand mathematician, found a solution of Einstein's equations for a rotating black hole, which had bizarre properties. The black hole would not collapse to a point (as previously thought) but into a spinning ring (of neutrons). The ring would be circulating so rapidly that centrifugal force would keep the ring from collapsing under gravity. The ring, in turn, acts like the Looking Glass of Alice. Anyone walking through the ring would not die, but could pass through the ring into an alternate universe. Since then, hundreds of other "wormhole" solutions have been found to Einstein's equations. These wormholes connect not only two regions of space (hence the name) but also two regions of time as well. In principle, they can be used as time machines."
Time is both a concept and physical, it is a concept because it exists without being touched by anything, it is physical because we exist in it.
Though there are mathematical ways that may allow one to travel back in time, there is no real way to do that with any technology that we know of. Time is real. It is real just as space is real. We exist in the space-time continuum. In a relativistic universe, time is part of space-time. What is being debated is the nature of consciousness. And that is addressed elsewhere on the boards.
Certainly time travel does happen in a black hole, if we chose to look at it that way. It's possible in that time for the (unlucky or lucky?) traveler who sails in will slow down. It won't appear that way to that traveler, of course, but to the outside observer, things will be slowing up until those outside observers lose sight of the voyager making the trip into the unknown. Whether or not the person travels back in time, goes "through" the black hole and emerges somewhere and sometime else, or simply becomes part of the collection of matter at the bottom of the gravity well can be debated ad infinitum.
See the related question below. It is, "What is time?" It may help, or it may not.
Time is REAL, although it is an illusion, because of Einstein's General Theory of Relativity in where gravity can effect time. So you see, because of the Earth and it's mass, and the other large bodies of mass around us, it shapes our "time." If we were to go to a different planet, it would have a different "time" than our own. Where I am going with this, is that black holes have such immense gravity, that it would completely warp time around you, but they think that you can time travel in one.
It would have to be a rotating black hole so that the singularity would be ring shaped, because then it could be skipped, and thus (as is postulated) there would be an "Einstein-Rosen Bridge" that would put you into another time/universe. But, the bridge would always collapse right before entry, so you would be crushed into oblivion in the singularity.
Were there any sightings of white holes or black holes in the last 100 years?
There have been no confirmed sightings of white holes in the last 100 years. Black holes, on the other hand, have been indirectly observed through their effects on nearby objects and the radiation they emit. The first direct image of a black hole was captured by the Event Horizon Telescope in 2019.
A black hole is a type of star with excessive gravity. Here are some sentences.
- The star was sucked into the black hole close by.
- A black hole will even absorb light.
- The scientist is studying a black hole.
The random walk is considered the journey that a photon takes in exiting the nucleus of the sun (or any star). In the sun's center lies a core of plasma in which hydrogen atoms are smashed together in such force that they fuse and form helium. Since the two hydrogen atoms (H2) have more mass than a helium atom (He) the mass byproduct is released as energy. This photon of energy then travels out of the core, but as it leaves it constantly runs into, is absorbed by, and re-released by other various atoms along the way.
If the earth was flat then it would be impossible for our earth to have seasons, because on half of the year we would have complete sunlight, the other half of the year we would have complete darkness. Also the North Pole would probably be the place with most volcanic activity, which it isn't. So that shows you somethings about what happens if the earth is flat. (and no, the earth is not flat or else all of the above would happen.)
It isn't because scientists have showed us pictures of the actual earth and its round
and you can fall off the side of the earth
Do you have to pay for mods on planet elder scrolls?
no all u need to do is make a free account at fileplanet. u can pay as a member for supposably faster downloads but a free account works fine.
It is possible to detect black holes by the X-rays emitted at the event horizon. That's one way to "see" them. It's tricky, but the tools of the modern astronomer are nothing short of astonishing. Let's take a walk.
Lots of times we think of telescopes as instruments through which bleery-eyed investigators peer for hours on end. It ain't like that now. In addition to the optical telescopes we know of (which now have CCD imaging equipment at the focal point and computers to look at the pictures), we have "eyes" pointed at the sky that can see across the electromagnetic spectrum, including X-rays.
The X-rays generated at the event horizon of a black hole appear as the result of the acceleration of gases into the gravity well. And we have things like the Chandra X-ray Observatory to see such things. Chandra launched in the summer of '99, and by the 2000's, stunning images were beginning to amaze observers. Including things like X-ray emission from Sagittarius A's supermassive black hole, which is at the center of the Milky Way.
Is uranium part of the stair steps?
Yes, uranium (U) is part of the Actinide series in the periodic table, which is located in the "f-block" or "inner transition elements" section. This group is often separated from the main body of the periodic table and is sometimes referred to as the "stair-step" region, although the stair-step itself typically refers to the dividing line between metals and nonmetals.
What is a least significant bit?
Imagine a decimal number, for example, 123 (hundred and twenty-three). Each digit has a corresponding place-value; the right-most digit has the place-value 1, the next digit (counting from the right) has the place-value 10, the next digit hast eh place-value 100. The right-most position (where the digit "3" is in this example) is in the position of least value - the least significant position.
When several bits represent an integer, the situation is the same, except that the numbers are in base-2 instead of base-10 (each position is worth twice as much as the position to the right). But you still have the concept of place-value, and the digit that represents the 1's position is the "least significant bit".
What is a black hole's role in the universe?
Black holes are made from the death of stars. Let me explain the process you see in a stars life there is a balance from gravity pulling the star inward and the explosive forces making it so hot. When a star uses up it's fuel it can implode on itself and turn into a black hole. The only reason there aren't way more black holes out there is since the star that is dying has to be at least 9 solar masses bigger than are sun.
What are the sub-branches of Astrophysics?
Astronautics and astronomy are two of the branches of space science. This deals with the study of everything that exists in the outer space. Astronomy and astronautics are composed of sub-categories.
France Anne Cordova is an American astrophysicist and former director of the National Science Foundation (NSF) from 2014 to 2020. She has also held various leadership positions in academia and research institutions throughout her career.
Are there two blackholes in the center of milky way galaxy?
To understand the 'how' of the presence of a supermassive black hole believed to be in the center of the Milky Way, one would need to know of the mechanism of its origin, which is tied to the origin of the galaxy itself. If sufficient matter is present in a given location, gravitational forces cause the matter to 'clump' and if sufficiently strong, it will continue to accrete and gain in mass; above a certain mass, given favorable conditions, a black hole will form. This is believed to have happened during the formation of our galaxy. In the case of the black hole at the galactic center, calculations indicate it has managed to acquire over four million solar masses.
What are black holes capable of?
The power or force exerted by black holes is all relative to the size of the black hole. Because black holes have many different sizes, they exert different amounts of forces for each black hole. However, I'm assuming that you are talking about black holes like the super massive black hole located in the center of our galaxy. These kinds of black holes are huge and are so powerful, they can trap light which is traveling 286,000 miles per second. So if you're talking about the big galactic black holes seen in the movies, the answer is the black hole is amazingly powerful and can trap anything that goes past its event horizon (point of no return).
To measure dose rate from cosmic rays, you can use a dosimeter that is sensitive to high-energy particles, while for terrestrial radiation you can measure using a Geiger-Muller counter. Differentiating between the two dose rates can be done by comparing the energy spectrum and composition of the radiation. Cosmic rays are primarily high-energy particles from space, while terrestrial radiation mainly consists of isotopes such as radon and thorium found in the Earth's crust.
Will a black hole come to earth?
Chances are in the trillions to 1 of earth being sucked in a blackhole (created by nature.) We are much more likely to be slammed into by an asteroid or a comet. Blackholes are pretty rare - they take a lot of energy to produce.
Scientist and astrophysicists have recently discovered a star that has an outer temperature of 80 degrees, so yes you can in fact touch this star, if you had a space ship that could actually travel to it, for more info about this star watch one of the more recent episodes of the universe
What would happen if a black hole swallows other black hole or if a Black hole swallow a white hole?
The answer is, if a black hole 'ate' another black hole, it would gain more mass, therefore it's event horizon(or area of influence) would increase. Once you cross the 'event horizon' it's a gravitational no return. Per the White Hole: It is found in theoretical science only. There has no proof of any white hole found (there has for black holes.) White hole ideas are not accepted by mainstream physicists, but a white hole may be the end product of the transmission of black hole matter in some part of the universe. If white holes exist the connection of a black hole to a white hole might actually be a wormhole or tunnel through 3 dimensional space. Black holes do have size and mass: if they did not have size, the difference in the size of the event horizon between black holes would not exist. The size of a black hole can be defined several ways - the gravitational force it generates (the mass), the physical size of the even horizon, or the size of an accretion disk (if there is one.) The problem most people have with the size of a black hole is that the very center of the black hole is a singularity: something that has no physical properties we can understand: it is so different that the word had to be made to describe it. In the sphere shells around the black hole are: the rest of the universe, "empty" space, matter and energy being bent (but not falling into the black hole), matter and energy falling into the black hole, (these 2 often show as an accretion disk), then the event horizon where the gravitational force is so strong now that even light can no longer escape, then the inner shell after the event horizon and this falls all the way down to the center, the singularity. Everything but the singularity has size, mass and is hot compared to the rest of hte universe (empty space again.) A black hole is an amazing thing but not a magical thing - it would probably be better if we used the term earler used - frozen star: one that no longer gives off heat.
Black hole is a collection of gases when a object enters it gases break into lakhs of small particles. they are so small we cannot see even with a microscope
Inside a black hole, all matter is crushed to a point of singularity: matter is crushed to the same density but zero volume.
However, scientist do not know what happens inside a singularity due to when you try calculating it with general relativity or quantum mechanics you end up with infinity to the power of infinity.
What types of science seek to answer questions about the universe for the sake of gaining knowledge?
Sometimes a student will say:"I am seeking knowledge for the sake of knowledge", implying that he is not after a diploma or a degree or something else of that sort. However,what he is doing is also wrong.
