Planets smashed into dust near supermassive black holes

October 28, 2011
Caption: A 2006 Hubble Space Telescope image of the "light echo" of dust illuminated by the nearby star V838 Monocerotis that became 600,000 times more luminous than our Sun in January 2002. This outburst is believed to have been caused by a giant collision of some kind, e.g., between two stars or a star and a planet. Credit: NASA/ESA. Collsions of smaller objects, such as asteroids or minor planets near a supermassive black hole could also be dramatic due to the huge collision velocities and would release a lot of dust." Credit: NASA/ESA.

( -- Fat doughnut-shaped dust shrouds that obscure about half of supermassive black holes could be the result of high speed crashes between planets and asteroids, according to a new theory from an international team of astronomers. The scientists, led by Dr. Sergei Nayakshin of the University of Leicester, publish their results in the journal Monthly Notices of the Royal Astronomical Society.

Supermassive black holes reside in the central parts of most galaxies. Observations indicate that about 50% of them are hidden from view by mysterious , the origin of which is not completely understood. The new theory is inspired by our own Solar System, where the so-called zodiacal dust is known to originate from collisions between solid bodies such as asteroids and comets. The scientists propose that the central regions of galaxies contain not only black holes and stars but also planets and asteroids.

Collisions between these rocky objects would occur at colossal speeds as large as 1000 km per second, continuously shattering and fragmenting the objects, until eventually they end up as . Dr. Nayakshin points out that this - radiation and frequent collisions - would make the planets orbiting supermassive black holes sterile, even before they are destroyed. "Too bad for life on these planets", he says, "but on the other hand the dust created in this way blocks much of the harmful radiation from reaching the rest of the . This in turn may make it easier for life to prosper elsewhere in the rest of the central region of the galaxy."

He also believes that understanding the origin of the dust near black holes is important in our models of how these monsters grow and how exactly they affect their host galaxies. "We suspect that the in our own Galaxy, the Milky Way, expelled most of the gas that would otherwise turn into more stars and planets", he continues, "Understanding the origin of the dust in the inner regions of galaxies would take us one step closer to solving the mystery of the supermassive black holes".

Explore further: Supermassive black hole is thrown out of galaxy

More information: The new work is published in "Are SMBHs shrouded by "Super-Oort" clouds of comets and asteroids?", Nayakshin S., et al., Monthly Notices of the Royal Astronomical Society, in press. A preprint of the paper can be seen at

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1 / 5 (7) Oct 28, 2011
Planets smashed into dust near supermassive black holes?

Or planets form out of dust near "supermassive black holes"?

The first planets observed beyond the solar system were planets that formed out of the supernova debris surrounding a pulsar [1]. That 1992 discovery has been confirmed in many subsequent studies at Pennsylvania State University and Poland's Nicolaus Copernicus University [2,3]:


2. http://live.psu.e...ry/56029


With kind regards,
Oliver K. Manuel
1 / 5 (3) Oct 28, 2011
"Could" occurs more often in this article than "good science" would allow.
Supposition is a poor alternative for information. Fishing for funding?
5 / 5 (4) Oct 29, 2011
a pulsar is not a supermassive black hole. a pulsar could never get that big. it would collapse, just like your theory does when you try to say neutron repulsion stops black holes from forming and causes the expansion of the universe when it would also stop pulsars from forming.
not rated yet Oct 31, 2011
"Could" occurs more often in this article than "good science" would allow.

Would it now? Oh my! What a poor question in search for alternatives to supposition! Occurs much too often!

Pokin fun.
not rated yet Oct 31, 2011
lol Burnerjack
Scrutinize jsdarkdestruction:
"could never", "it would collapse", "when it would".

We could or would or should never allow this!
Where would! we be without are poor alternatives for information or suppositionals?

Gone fishin...

not rated yet Oct 31, 2011
Obviously an failed attempt at spelling.
I would or could or should be much better off with suppositions.

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