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ong>Explanation:

Astronomers may have discovered a new kind of survival story: a star that had a brush with a giant black hole and lived to tell the tale through exclamations of X-rays.                                                        

Data from NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton uncovered the account that began with a red giant star wandering too close to a supermassive black hole in a galaxy about 250 million light years from Earth. The black hole, located in a galaxy called GSN 069, has a mass about 400,000 times that of the Sun, putting it on the small end of the scale for supermassive black holes.

Once the red giant was captured by the black hole’s gravity, the outer layers of the star containing hydrogen were stripped off and careened toward the black hole, leaving the core of the star – known as a white dwarf – behind.

“In my interpretation of the X-ray data the white dwarf survived, but it did not escape,” said Andrew KING of the University of Leicester in the UK, who performed this study. “It is now caught in an elliptical orbit around the black hole, making one trip around about once every nine hours.”

As the white dwarf makes its nearly thrice-daily orbit, the black hole pulls material off at its closest approach (no more than 15 times the radius of the event horizon – the point of no return – away from the black hole). The stellar detritus enters into a disk surrounding the black hole and releases a burst of X-rays that Chandra and XMM-Newton can detect. In addition, King predicts gravitational waves will be emitted by the black hole and white dwarf pair, especially at their nearest point.

What would be the future of the star and its orbit? The combined effect of gravitational waves and an increase in the star’s size as it loses mass should cause the orbit to become more circular and grow in size. In this case, the rate of mass loss steadily slows down, and the white dwarf slowly spirals away from the black hole.

“It will try hard to get away, but there is no escape. The black hole will eat it more and more slowly, but never stop,” said King. “In principle, this loss of mass would continue until and even after the white dwarf became a planet, with a mass similar to Jupiter, in about a trillion years. This would be a remarkably slow and convoluted way for the universe to make a planet!”

Astronomers have found many stars that have been completely torn apart by encounters with black holes (so-called tidal disruption events), but there are very few reported cases of near misses, where the star likely survived.

Grazing encounters like this should be more common than direct collisions given the statistics of cosmic traffic patterns, but they could easily be missed for a couple of reasons. First, it can take a more massive, surviving star too long to complete an orbit around a black hole for astronomers to see repeated bursts. Another issue is that supermassive black holes that are much more massive than the one in GSN 069 may directly swallow a star rather than the star falling into orbits where they periodically LOSE mass. In these cases, astronomers wouldn’t observe anything.

“In astronomical terms, this event is only visible to our current telescopes for a short time – about 2,000 years,” said King. “So unless we were extraordinarily lucky to have caught this one, there may be many more that we are MISSING. Such encounters could be one of the main ways for black holes the size of the one in GSN 069 to grow.”

King predicts that the white dwarf has a mass of only two tenths the mass of the Sun. If the white dwarf was the core of the red giant that was completely stripped of its hydrogen, then it should be rich in helium. The helium would have been created by the FUSION of hydrogen atoms during the EVOLUTION of the red giant.

“It’s remarkable to think that the

ong>Answer:

The scope of FORENSIC science study is vast. You can GET jobs in various governments & private SECTORS. The study will improve your skills and knowledge. After completing your degree, you can open your own forensic practice & forensic service offices. You also may EMPLOY in Forensic Laboratories, Detective Offices, Banks and other GOVT. and private agencies

r Anil Ambani's debt-laden Reliance Communications Ltd (RCom) said it would seek a fast-track resolution through the bankruptcy court National Company Law Tribunal to resolve its indebtedness, the SHARES PLUNGED as much as 54.3 per cent to Rs 5.3 apiece on Monday in Mumbai trading, Reuters reported. According to an ET REPORT, Swedish TELECOM gear maker Ericsson is set to file an application in the Supreme Court, pleading that all personal assets of RCom chairman Anil Ambani be seized for breaching the top court’s order to repay the Swedish telecom EQUIPMENT maker its dues.

1 and 6 are the CORRECT OPTION for the given QUESTION.

ong>Answer:

Rod, one of TWO types of photoreceptive cells in the retina of the eye in vertebrate animals. Rod cells FUNCTION as specialized neurons that convert visual stimuli in the form of photons (particles of light) into CHEMICAL and ELECTRICAL stimuli that can be processed by the central nervous system.

I THINK it is HELPFUL to you I think so

(i) option D

(ii) option B (are vectors for MNY DISEASES)

EXPLANATION:

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ong>Answer:

1) Viruses do not grow or reproduce by themselves, which makes them non-living. HOWEVER, when a virus enters the living cell of an organism, it makes use of the resources in the HOST cell and starts reproducing. ... Due to this, viruses are considered to be on the borderline of the living and non-living.

2) FERMENTATION is the process of converting carbohydrates to alcohol or to organic acids using microorganisms, such as yeasts or bacteria. This process takes place when there are beneficial bacteria present that break down the starch and sugars in the food.

3) In the absence of microorganisms the earth would become a heap of dead plants and animals , because microorganisms helps in decomposing of the dead plants and animals , they work as a decomposers, without them there will be no decomposing of the dead ORGANISMS , and hence lead to the health problems.

4) i) nitrogen

ii) because peas' ROOTS bacteria name rhizobium which do nitrogen fixation in the soil and nourished it.

5)At warm condition bacteria turn the milk into curd. So in summer the temperature is high and favourable for the bacteria growth. As a result, the bacteria multiply faster which leads to change the milk into curd. That iss why it takes more time in winter for the curd to set compare to summer time.

6) a) by mosquito bite

b) by air or sitting cold infected person

c) cut or wound by iron substance

d) by taking infected and impure eatable itens

ong>Answer:

Cone cells, or cones, are one of the TWO types of photoreceptor cells that are in the retina of the EYE which are responsible for COLOR vision as well as eye color SENSITIVITY; they function best in relatively bright light, as opposed to rod cells that work BETTER in dim light.

ong>How would you confirm that a COLOURLESS liquid GIVEN to you is pure water? Evaporate the colourless liquid on a low flame. If no residue is left and boiling EXACTLY at 100 ºC then it is pure water otherwise not.

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Reforestation is the natural or intentional restocking of EXISTING forests and woodlands (forestation) that have been depleted, usually through deforestation. Sometimes the term "re-afforestation" is used to DISTINGUISH between the original FOREST cover and the later re-growth of forest to an area.

>Attention was not paid by the

This work would be finished by him

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ong>Answer:

you can write in ENGLISH PLEASE

ong>ANSWER:

Evaporation is the NATURAL process of DRYING out water .

EXPLANATION:

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ong>EXPLANATION:

There are 6 electrons in the OUTER ORBIT of an ATOM of sulphur

Explanation:

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ong>⇒ Given:

The mass of a cannon is 500 kg

The velocity at which it was fired was 0.25 m/s.

⇒ Given Options:

1️⃣ 20 kg m/s

2️⃣ 2550 kg m/s

3️⃣ 125 kg m/s

4️⃣ 0.125 kg m/s​

⇒ To Find:

The momentum of the cannon.

⇒ Solution:

It is given that the mass of the cannon is 500 kg and the velocity at which it is fired is 0.25 m/s.

As we are asked to find the momentum of the cannon, we first need to find the formula of momentum.

That is:

So, applying the VALUES we know into the EQUATION:

The required CORRECT option is:

3️⃣ 125 kg m/s ✔

Momentum:

The amount of MOTION a certain object has is termed as momentum. It is defined as the product of the mass of the object and its velocity. It is directly proportional to its quantities - the mass and velocity and an increases in momentum can be OBSERVED when either of these increases.

All CHORDATA are

• (a)

ong>Explanation:

2011 CENSUS SEX Ratio 877

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The FIGURE is not VISIBLE.

ong>ANSWER:

Newton's second law

Explanation:

The statement "the RATE of change of momentum is proportional to the force APPLIED and the change of momentum is in the DIRECTION of force"

Newton's second law

ong>Answer:

NEPHRON

EXPLANATION:

nephron is FUNCTIONAL UNIT which fliterates blood

Please write FULL QUESTION than I will answer your question.

PHOTOTROPISM(skototropism)

These two forces are called action and reaction forces and are the subject of Newton's third LAW of motion. Formally STATED, Newton's third law is: For EVERY action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

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A Chemical REACTION occurred.

Explanation:

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ong>Answer:

1.

a rounded UNDERGROUND storage organ present in some plants, NOTABLY those of the lily FAMILY, consisting of a short stem surrounded by fleshy SCALE leaves or leaf bases, lying dormant over WINTER

Natural gas is a fossil fuel, though the global warming emissions from its COMBUSTION are much lower than those from coal or oil. Natural gas emits 50 to 60 percent less carbon dioxide (CO2) when combusted in a new, EFFICIENT natural gas-power plant compared with emissions from a typical new coal plant.

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ong>Answer:

1 st September 1939 WORLD WAR 2 started and ended in 2nd September 1945

ong>Answer:

a)The modern PERIODIC table is developed after the periodic LAW and a periodic table given by Mendeleev. In the latter part of the 18th century, Mendeleev made his periodic table.

b) other NAME of modern periodic table is ' long form of periodic table '.

c)Modern periodic law STATES that the physical and CHEMICAL properties of elements are the periodic functions of their atomic number.

sorry I can't UNDERSTAND your QUESTION

it is in TELGU

ong>Answer:

Incident RAY – A ray that strikes the surface separating the TWO optical media is called the incident ray.

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ong>ANSWER:

WAVELENGTH

Answer: The distance travelled by a wave in the DIRECTION of wave propagation during TIME equal to PERIODIC time is known as the wavelength of the wave

ong>Answer:

The SECOND Law of Thermodynamics is about the quality of energy. It states that as energy is transferred or TRANSFORMED, more and more of it is wasted. The Second Law also states that there is a natural tendency of any isolated system to degenerate into a more disordered state.An example of a reversible process is ideally FORCING a flow through a constricted PIPE. Ideal means no boundary layer losses.Therefore as a redox reaction proceeds there is a HEAT change related to the extent of the reaction, dq/dξ = T(dS/dξ).

Explanation:

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the SQUARE footage of the you send me

ong>Answer:

Neckbreaker

Explanation:

In professional wrestling, a neckbreaker is any throw or slam that focuses its attack on the opponent's neck. ONE type of neckbreaker involves the WRESTLER SLAMMING an opponent's neck against a part of the wrestler's body, usually the knee, head or shoulder. The other type of neckbreaker is a slam technique in which the wrestler throws an opponent to the GROUND by twisting the opponent's neck. This also REFERS to a "back head slam" where a wrestler drops to the mat while holding an opponent by their neck

The theory of relativity usually encompasses TWO interrelated theories by Albert Einstein: special relativity and general relativity. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of GRAVITATION and its relation to other forces of nature

Explanation:

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ong>Answer:

Monetized benefits included REDUCTIONS in medical costs and mortality associated with diarrheal diseases, productive time saved from fewer diarrhoea cases and ACCESSING OUTSIDE defecation options, and increase in the property VALUE of having a toilet

Defence Research and DEVELOPMENT ORGANISATION.

50 degree

Explanation:

hey

Explanation:

Growers estimate 30% damage in UP; crop hit in Maharashtra, Gujarat too

Digging teeth into a succulent Indian mango is likely to get costlier for consumers abroad after unseasonal rain and hailstorms between February-end and early-April lashed themango-producing belts across the WORLD’s largest producer during the flowering stage.

The Mango Growers’ Association of India (MGAI) estimates that the damage caused is as high as 30 PER cent in Uttar Pradesh, among the KEY mango-growing States, while Maharashtra and Gujarat, which SUPPLY nearly 12 per cent of the delectable Alphonso variety overseas, have also been hit.

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