A cloud of gas a radius of about 100 a. that is incident on a supermassive black hole at the center of the milky Way, may be visible after the protoplanetary disk surrounding a young low-mass star, think of astrophysics of the Harvard-Smithsonian center for astrophysics in Cambridge (Massachusetts, USA).
Collapsing under the influence of BH protoplanetary cloud in the view of the artist (figure David A. Aguilar / CfA).

A study by Ruth Murray-clay and Abraham Leeb shows that planets can be formed even in the strong gravitational field of a giant (the largest in the Galaxy) black hole. This is somewhat unusual assumption: it was previously thought that the center of the Galaxy into force impacts of shock waves from frequent supernovae and "gravitational vacuum cleaners" supermassive black holes (SMCG) is ill-suited for the emergence and evolution of protoplanetary disks.

Relevant work published in the journal Nature Communications.

That's why earlier the idea of the protoplanetary disk in a place seemed inappropriate, and a group of astronomers who discovered this gas cloud using the Very large telescope (Chile), have suggested that this is the result of collision of two ordinary stars, a substance which, after the collision took the form of a cloud.

However, Ruth Murray-clay and Abraham Leeb drew attention to the fact that the annular gas structure close to a group of young stars that rotates in 0,03-0,04 PC (approximately 0.1 light year) from SMCD Sagittarius A*, weighing 4.3 million solar. Now astronomers have discovered here dozens of bright stars of spectral class About that almost inevitably means the presence in the area, perhaps hundreds dimmer stars such as the Sun.

According to calculations, the protoplanetary disk is deprived of its young star that falls into a black hole. Due to weak luminosity of the star itself cannot be seen, but its protoplanetary disc is illuminated by ultraviolet radiation from the surrounding young stars and is currently deformed SMCD much more (which is why it and was able to see the earth astronomical instruments).

However, the constructed model is a significant problem. Saved a small chance, about 0.1%of that keen on the gravity of the black hole young star still has the same orbit as the gas cloud.

In addition, according to the model, the gas cloud must have a relatively dense core that will probably even be able to see through a telescope approaching clouds to the black hole and the corresponding heat the average of its gas.

Found the protoplanetary disk is actively destroyed by gravity SMCD and radiation from nearby stars because its coming to BH items are from her, just 3 100 svetsilovich radii. But he and his star will be of interest to astronomers for a long time. According to estimates, only in the summer of 2013 star will converge with Sagittarius A* so, to begin to implement the substance of its accretion disk. From this moment and during the next 30-40 years surroundings SMCD will begin to emit intense glow (perhaps even the jets)that will help astronomers better understand the phenomenon of "quiet" Central SMCD our Galaxy, always stood out against the background of continuously absorbing huge portions of interstellar gas voracious SMCD other spiral galaxies.

The most interesting: first obtained direct evidence that protoplanetary disks can be the stars, located in the center of galaxies, among the most powerful gravitational influences and shock waves from supernova explosions. Despite the death of this protoplanetary disk, it is clear that in the ring, rotating around Sagittarius A*, there are many other stars who are, apparently, there are also protoplanetary disks and possibly the world. The age of this "star rings" is estimated by researchers in 4-8 billion years, which is enough to fold a planetary system and, based on the experience of the Solar system, the emergence of intelligent life.

"Captures the very thought of planets formed so close to the black hole, " says Abraham Leeb. - If our civilization was inhabited by one of these planets, we could test Einstein's theory of gravity is much better, and get clean energy, throwing our waste into the black hole".

Explain that in 1971 Stephen Hawking proved important theorem, concerning the possibility of extracting energy from the black hole, having summarized the results obtained earlier by Demetrius Presided. The theorem States that the area of the event horizon of a black hole can not decrease; whatever happens with a black hole, the area of its surface" must either increase or remain constant. BH is a pretty deep gravitational potential pit from which energy can be released much more effectively than even in the fusion process. This is possible thanks to the mechanism of Penrose. Before reaching the event horizon of the body through ergosphere BH, can get much greater acceleration than it had before getting into ergosphere, just as it happens with the gravitational maneuver.

We, however, are not as optimistic as cited researcher: with all the advantages extract free energy from the black hole, the most powerful periodic x-ray source, located in 0.1 light year from your planetary system, test, most likely, outweighing even the above energy happiness.

Based on the materials of the Harvard-Smithsonian center for astrophysics.