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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
What is Schwarzchild radius of a 2 solar mass black hole is about?
The Schwarzchild radius of a 2 solar mass black hole would be about 5.9 km.
Is negative black hole present?
There is no such concept of a negative black hole outside the fictional computer game involving Sentry Catapult.
How are supernatural black holes made?
If you use the Search tool at the top of the page and search on "gravity," many questions will be displayed that you can explore.
*While this is the currently the accepted answer by society, in truth no one knows what gravity truly is. The term "force" is a generalization used to define what they do not understand.
Addition:
There is a theory that gravity is made up of massless, uncharged particles called "Gravitons". This theory isn't widely accepted because gravity doesn't work on a small atomic scale. The theory is called Quantum Gravity.
Do medium size stars become black holes?
No. They do not have enough mass to become black holes. Depending on the mass they will either become white dwarfs or neutron stars.
We currently use anti-electrons (positrons) on a regular basis in the medical application we know as PET imaging. Additionally, we use anti-protons in nuclear research. The Large Hadron Collider runs with protons and antiprotons circulating in the acceleration ring (in opposite directions), and then "collided" in an experimental area packed with sensors and detectors.
It should be noted that matter and antimatter don't "like" each other. Any "contact" between the two leads to mutual annihilation. In the case of the positron, which is produced in beta plus decay, that positron will eventually "run into" an electron, and mass of the two particles will be entirely converted into energy. Links have been included for further investigation, and you'll find them below.
What is our black hole called?
The supermassive black hole at the center of our Milky Way galaxy may not have a formal name yet, but takes its identification from a powerful radio source "Sagittarius A*" (where the asterisk is part of the name). Because of the discovery of this energy source it's commonly believed a black hole must be located there, powering the emissions perhaps because of the black hole's accretion disk or relativistic jets.
Who is the father of mathematical astrophysics?
Subrahmanyan Chandrasekhar calculated the famous "Chandrasekhar Limit" and did a lot of other seminal work in astrophysics. The Chandra X-ray space observatory was named in his honor.
The eruption of Pompei in 76 AD was the last straw. Romans who had invested in prime seaside real estate there saw the value of their portfolios shrink to bupkes, as the hot sulfur and ash of the volcano added to the constant direct sunlight, and the resort hotels began receiving cancellations by the thousands.
The nation's great thinkers appealed to its scientists to "do something". Within months, Gyrus and his team of researchers and engineers proved the feasibility of their plan to install an axis of symmetry through the earth, and to start the globe rotating on it, thus evenly distributing both the temperatures and the hours of daylight and darkness, uniformly and equitably, to all the inhabitants thereof.
By continuously deploying hundreds of excavation crews to the poles ... each of which periodically relieved both themselves and the crew who had gone before them ... the axis, along with its bearings, was installed within three years. It is an historic testament to the value of project management and planning that only once during the entire operation was there a delay, when one unfortunate crew chief named Vas Deferens, upon arriving on site, opened the box of balls which he had been tasked to deliver and discovered that he had lost his bearings.
Finally, with the axis completed, beginning slowly and building to a crescendo, the globe was spun up to its final angular velocity of nearly 4.4 milliradians per minute, where it remains to this day, with only negligible deceleration through the centuries that have intervened.
Whats the key hole in the center console in 1997 tl 2.5 acura?
Assuming that your TL has an automatic transmission, the "keyhole" is an emergency override to unlock the shift lever if needed. Simply place your Acura's key (or anything of a similar shape and width - a feeler gauge will do in a pinch) in the slot, and you'll be able to move the shift lever into any desired gear. Use this feature with caution...
What element is in a black hole?
It is not expected that elements would survive as such, within a black hole. Gravitational force would crush everything together to the point where no atomic nuclei remain intact.
What type of star burns the longest?
The least massive stars, i.e., the red dwarves. More massive stars get more pressure and temperature, and therefore burn their fuel up faster. For comparison, while a red dwarf might shine for trillions of years, the most massive stars run out of fuel after just a few millions of years.
What is the second star in the alpha centauri star system?
Alpha Centauri, although it appears to the naked eye as a single star, is a binary pair. Together they are designated Alpha Centauri AB, the more massive and luminous in the pair designated Alpha Centauri A, the less massive and luminous Alpha Centauri B. Together, this pair is the third brightest "star" in the night sky. There is a third star probably interacting gravitationally with the pair, Proxima Centauri, also designated Alpha Centauri C, a red dwarf which is not visible to the naked eye but is the next closest star to our Sun.
Alpha Centauri B has about 90% of the mass of our Sun and is about 45% as bright.
Note that Alpha Centauri B is not the "second" star (second brightest) in the constellation Centaurus: that is Beta Centauri, which is itself a trinary star system.
Who worked out that the planets orbits are flattened circles?
Johannes Kepler, using measured planetary positional data provided by Tycho Brahe, showed that the orbits of the planets were ellipses ("flattened circles"), with the Sun at one focus of the eliipse.
What are the steps of stellar evolution in order?
You can find an overview of stelar evolution in the Wikipedia article entitled "Stellar evolution".
Why does Sagittarius A indicate that a black hole is at the center of the universe?
Sorry, the universe does not have one center. According to the usual interpretation of the Big Bang theory, any and all points in the universe can equally be considered centers of the universe.
Perhaps you meant to ask "Why does Sagittarius A indicate that a black hole is at the center of the Milky Way Galaxy?" instead. Galaxies do have distinct centers, all spiral galaxies are now believed to have a supermassive black hole at their centers, and our galaxy: the Milky Way is a spiral galaxy. The observations of the object called Sagittarius A match what would be expected of a supermassive black hole and are in the right galactic direction to place it at the center of the Milky Way galaxy.
A long term comet is a comet whose final orbital`s path take more than two-hundred years. An example is Hale- Bopp`s comet that had an orbit of 4,200 years. The following is a general overview about comets:-
The center of the comet , then nucleus, is very smal compared to the rest of the comet, and has a very small diameter. The nucleus is composed or rocks and ices, and a comet usually has no value, or " dead" as they call it, if its ices melt.
The other parts of the comet only exist when the comet is near the sun.The sun`s solar energy produces heat the melts the ice down, forming the glowing " head " , or comet. The ices of the comet are made of various molecules (such as carbon, nitrogen, oxygen, and water), and they weigh differently, so, some can escape the nucleus' weak gravity more easily, while others cannot.. Therefore, another minor feature of the coma is the Hydrogen Cloud, which forms the outer part of the coma.
Finally, the tail. Most comets usually have two tails, where one exceeds the other in brightness.. The tails form as a result of the sun's solar wind - the stream of charged particles that emanate from the sun. The solar wind forces gas and dust out from the comet and forces the material into very narrow (relative to their length) tails. The tails always point away from the sun.
The gas and dust form separate tails due to the charge of their constituents. The dust is not highly charged, and so forms a bent tail that slightly lags behind pointing directly away from the sun; its color is yellow because it reflects the light of the yellow sun. The gas tail is much more highly charged, and so the solar wind acts to funnel it much more effectively than it does the dust cloud; its color is blue due to molecules that make it up.
Due to the nature of how the tails form -- material being blown off of the comet - the tails are how comets loose the bulk of their mass. The material usually dissipates after several hundred years, but before that happens, the material usually will continue in the orbit of the comet. If the Earth plows through this, we see a meteor shower.
How big is the center of a black hole?
There are several ways of looking at this matter.
First, the black hole itself has an indeterminate size; we cannot know what the diameter is.
Second, the size would depend on the mass of the black hole.
Third, the only "size" (as in physical size) that might seem to have any meaning would be the size of the Event Horizon, which is much larger than the black hole itself might be.
Finally, we're not sure whether the question has any real meaning. Even Stephen Hawking is reconsidering the concept of "black hole" and he now says that black holes, as previously understood, do not exist. So the matter is up in the air.
Ask this question next year, and we may have more information.
Where do Black Holes lead to in space?
They don't "lead" anywhere. Any mass that falls into the black hole stays in the black hole.
There is a theory that, in the case of rotating black holes, matter may emerge elsewhere from a "white hole".
It's an idea that remains controversial and highly speculative.
How come all stars don't form into black holes?
A black hole forms only when the star is large enough that the gravitational pressure exceeds the quantum degeneracy pressure.
How do aliens from planet scardox have a baby?
Hi im scardoxalien4323 and im gonna tell you how to help your aliens give birth.
1)you put two aliens back to back
2)wrap up the two aliens in their goo
3)put is in the egg then in the fridge for an hour then wait 5-9 days
4)then you might see a leg or an arm apere in one one of the aliens
5)hold open the back of the pregnant alien open then get your fingers and get out the alien
CAUTION:your aliens head may explode
Well, the Earth, the other planets and a vast number or other bodies are currently orbiting the Sun (Sol). And, the Solar system is currently orbiting the center of the Milky Way galaxy. And, the Milky Way and an infinite number of other galaxies are currently moving through the universe, known and otherwise along with an almost incalculable amount of dark matter. And, all of this universe, known and otherwise, exists primarily in space in a state of perpetual free fall.
Well, free fall. The Earth is technically always falling. Dropping on the other hand, while sometimes synonymous with falling is not so much so in this case. In this question dropping gives the impression that the Earth is suspended somehow by something, and this is not the case.
So, no. The Earth is not going to drop.
Is it possible for a black hole to disappear and if it is how long will the process take?
Yes, black holes slowly evaporate after meeting critical mass or without any planets or star around it
When did earth change into blackhole?
Earth will not turn into a black hole due to its mass being insufficient for it to collapse into that state. Earth will eventually be engulfed by the Sun as it expands into a red giant in about 5 billion years, but it will not become a black hole.
What is cosmic rays practical uses?
I believe they are mainly used for observational purposes - that is, they are observed, and conclusions are taken about the Universe.
What is a black hole in the sky and how does it formed?
There exists variant theories for the existence of Black Holes; one hypothesis has Black Holes being created from the collapsed stellar core of larger than three solar masses, while another has black holes predating stars and forming upon the instance of the Big Bang. In fact, the concept of a star growing or shrinking has little to do with gravitational accretion. So if a Black Hole is just a converted state of stellar evolution, then should we expect that the Black Hole size should be dependent on the amount of material being attracted and annihilated upon its Event Horizon? Per the current consensus, there is not a relevant relationship between the observable size of the accumulated bulge about the Black Hole and the size of the Black Hole itself.
And considering the Black Hole radiation jets act as the safety valve for the reactions within a Black Hole, one might speculate that, like a star, the size of the Black Hole has more to do with its internal reactions and less to do with the matter being converted upon its Event Horizon. Still another such theory has their formations predating galaxies and or even predating normal matter itself, existing unto the moment of the Big Bang itself (i.e. unfolding of SpaceTime into a traditional fourth dimensional condition).
