what is the black material in astronomy?
111888
I guess you mean dark matter. We cant see it but we know it´s there. It has to be or the galaxies wouldn´t be galaxies. Dark matter doesn´t seem to emitt or absorb radiation like normal matter. In short: we dont know what it is.
943578
do a yahoo search on    "black absorption and radiation"
751620
You mean, what color is the sky on the moon?  No color, or black.  The moon doesn't have an atmosphere.
47984
Matter that is in space but is not visible to us because it emits no radiation by which to observe it. The motion of stars around the centers of their galaxies implies that about 90% of the matter in a typical galaxy is dark. Physicists speculate that there is also dark matter between the galaxies but this is harder to verify.\nhttp://pdg.web.cern.ch/pdg/cpep/glossary.html\n\nMatter that does not emit enough light or other radiation to be observed directly. Most of the matter in the universe is believed to be of this type. Cold dark matter had a low velocity compared to the speed of light during the epoch of recombination. An example would be elementary particles with mass about equal to that of a proton or higher. Hot dark matter had a high velocity (near the speed of light) during the epoch of recombination. An example would be light elementary particles.\nhttp://www.nap.edu/readingroom/books/cosmology/glossary.html\nIn cosmology, dark matter consists of matter particles that cannot be detected by their emitted radiation but whose presence can be inferred from gravitational effects on visible matter such as stars and galaxies. Estimates of the amount of matter in the galaxies, based on gravitational effects, consistently suggest that there is far more matter than is directly observable. ...\nhttp://en.wikipedia.org/wiki/Dark_matter
1059922
bec the color black hide alot of 'thing'
128460
It might be, or it might be a neutron star. We do not really know. \n\nThere are some other objects in the sky which are much more certainly black holes, from their masses and other properties.
196427
Aerogel is the substance developed by JPL to capture interstellar dust particles.  The only reference to light is that the substance has a low refraction index, which indicates a lower tendency toward image distortion.  It also has a low thermal conductivity rating, so it will let light pass through, but not heat.  Hope that's what you're looking for.
928062
Well you can use spectroscopy to find out the composition of distant objects in space.  IE if a star emits light near (usually a slight red shift from distant objects) the emission lines of helium or mercury you could conclude that those elements are present.\n\nMike
628285
A black object is only visible when surrounded by light reflecting items.  Example: if you wrote on a completely black piece of paper with a black marker you would not be able to see it, but you would if it were white paper
555902
They are water droplets. Huge amount of them will be able to partially block sunlight. So, we see them as being black.
746571
D)supernovae. Every single material in the universe except helium came from supernovae
268021
According to current estimates, roughly 400,000 years.  This is what we can tell from the data from WMAP, which was launched to measure the microwave background radiation.  It is this radiation that is the leftover glow from when light decoupled from matter, which is the point at which the universe would have "turned black".
529002
The obvious answer is black holes. But other kinds are non reflective nebulae and dark matter.
525332
I believe it's black.
679272
In real life, everything no matter how black reflects either a tiny bit of light or infrared rays.  Even if it's completely black, we could still located with sound or radio waves.  \n\nBy the way, notice that the stealth fighter and bomber are black.\n\nIn scientific terms, something that is completely black can still be found by following light sources behind it because by definition, a black object either blocks or absorbes light.  So it has to disturb light sources coming from "behind" it.  By the way, that's how many plants, moons, and black holes were proven, as I recall.
566942
They are called black dwarfs, and they do emit some radiation, but it would be next to impossible to sort it from the background radiation noise since it would be in the far infrared.  Blackbody radiation occurs by a perfect absorber/emitter, and black dwarfs are not this.  They are called black dwarfs because of the amount of radiation they emit makes them essentially "invisible" to any type of detector.  They are theorized to have an internal temperature in the hundreds to low thousands of celsius, quite far from the internal temperatures of main sequence stars.\n\nThe only way we could even see them would be by their gravitational influence on light passing by the black dwarf from stars in their background.  Only then, using a wide detector and via photometry, would be even to begin to see this object.  Luckily, we can estimate its mass based on the amplification via gravitational microlensing and the formulas associated.  This is what I did my senior thesis on :)\n\nBy the way, black dwarfs shouldn't be around yet anyway.  No star has cooled enough to be even considered "black" (brown, yes, but not black).
400506
"Crude oil" as it comes out of the ground gets refined (basically distilled) into many different components.  The major ones are methane (natural gas), naptha, gasoline, kerosene, diesel, lubricating oils, heavy oils, and residual solids.  The farther down that list, the darker the color.\n\nMany of the residual solids end up in products such as tar and asphalt.  That's where all the "black stuff" goes.