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Because it is so compact that within some distance of the singularity, the escape
velocity from it is equal to or greater than the speed of light. That means that light
which passes close enough to it is captured, can't escape, and the central region,
close enough to the singularity, can never be seen, since no light can leave it. All
of that is just a complicated way of saying that from a distance, it has to appear
totally black, not only visually but at all wavelengths.
Cygnus X-1, so-called because it is the brightest X-ray source in the constellation Cygnus, was the first object identified as a probable black hole.
Just to be very precise here; We have "discovered" ZERO "black holes". We cannot be entirely certain that our interpretation of the physical anomalies is correct, or that the math that describes a black hole is actually describing something real. But the math that describes super-massive objects suggests that certain phenomena will behave in a certain way, and our scientists and astronomers have detected, to the limits of our observational ability, the behavior that the theory suggests.
So we're "fairly sure" that black holes exist, and that we have located some - but until we go there and orbit a supermassive invisible gravity source, we cannot be completely sure.
Yes it is possible. I usually see it every dark night I look at the stars but as we are in the galaxy it stretches all the way around us.
The galaxy appears as a broad band of light from the billions of stars in the Milkyway. The band stretches across the entire sky. The center of the galaxy is towards the constellation Sagittarius and there are dark patches there because dust obscures the stars near the galactic center.
(But not all of it), but for the best results the Southern Hemisphere is best. Chili seems to be the preferred location, probably because of the height of the mountains.
See related links for pictures of "part of" the Milky Way Galaxy.
As for all viewings, you will need to find a spot without any light pollution. [See related question]
Black holes can't be seen directly, but there is strong evidence that certain
X-ray emissions are caused by black holes.
The first really good candidate to be considered a black hole was Cygnus X-1.
This was discovered in 1964, but only about ten years later did scientists think
it could be a black hole.
It was about 1990 that most scientists decided it really must be a black hole.
It's not possible, and it never will be, to "see" a black hole, for the same reason that
such an object is called a "black hole" ... light that hits it stays there and never leaves.
So there's no light coming from it by which to see it. Its presence can only be inferred by
observing the behavior or appearance of other objects in its neighborhood.
Most definitely YES.
Visit this website:
http://spaceflight.NASA.gov/realdata/tracking/
Click on "Sighting Opportunities", Select Country, State (or Province), City
It will say when and where to look.
It is always just after sunset or just before sunrise, when it is dark enough to see it, but the Space Station is being lit by the Sun.
It is very bright - brighter than any star, and silent. It appears in the West, takes about 3 minutes to cross the sky, passing 240 miles overhead.
I've seen it many times. It's really amazing.
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Another link for the same sort of data;
http://www.spaceweather.com/flybys/index.php
The path is generally either from southwest to northeast or northwest to southeast, but always sort of west-ish to east-ish.
The "no-hair" theorem states that black holes have only three properties for an outside observer: charge, mass, and spin. In other words, given two black holes with these three properties being identical, no other information could be obtained to tell them apart - for example, whether one had been made of matter or antimatter. To tell apart two separate black holes, and say one is different from another, a distinction would need to be made based on one of these properties.
Sometimes for convenience, notional differences are emphasized based on mass (which directly determines their size), like, a microscopic black hole, a stellar mass black hole, an intermediate mass, or supermassive black hole such as is found in active galactic nuclei. Sometimes the term primordial black hole is used to indicate the origin of a black hole believed to have been created during the big bang. A distinction based on spin or charge could lead to an apparent difference which, again, really only reflects nomenclature - non-spinning, uncharged "classical" black holes are sometimes referred to as "Schwarzschild black holes" since a non-spinning solution to Einstein's field equations was first found by the mathematician of that name, or another example being a "Kerr black hole" which also has reference to its discoverer, or the Reissner, Nordstrom or Newman metrics describing charged (spinning, or non-spinning) black holes.
The real idea came from the fact that nothing can escape a black hole once its gravity has begun to take you in. The very dense place has such a tremendous category that it can even preven photons (particles of light) from escaping its gravitational pull.
And i suppose without light, things would be black. Thus the term is coined black hole.
No. First of all, a black dwarf is not a planet; it is the cooled remnant of a long dead star. Second, no black dwarfs exist, as the universe is not old enough for one to have cooled. Third, a black dwarf could not be seen as it gives off no light.
Depends on which one, and when, but in general, yes. The International Space Station is EASILY visible when it goes overhead at night; with all the new modules and solar arrays, it is visible now during the DAYTIME if you know where to look. Visit SpaceWeather.com to find the schedule of overflights for your location.
Because of the way that the Iridium cell phone satellites were designed, you can sometimes see an "Iridium flare" when sunlight reflects off of the mirror-bright solar panels. Again, you have to know where to look and when, or be REALLY lucky.
But if you lay on the ground looking up - and if the sky is dark enough - you can see the satellites going over.
Yes WE can see the artificial satellite by naked eyes only at Space research Center otherwise it is not possible to see the satellite as it Thousand's of kilometer away from the ground
Where I live we can see satellites at night with the naked eye, I don't live anywhere near the Space Research Centre.
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Is dwarf planet Ceres a gas or rocky planet?
No. Ceres, which used to be considered an asteroid, was recategorized as a "dwarf planet" in 2006, about the same time that Pluto was. Ceres is a small rocky body, the biggest in the asteroid belt.
How big is Eris compared to earth?
The dwarf planet Eris truly deserves its designation as "dwarf planet"; it is less than one quarter of Earth's diameter, and about one percent of Earth's mass.
Why is Pluto no longer a planet?
because Pluto is like an asteroid it is so tiny
What is the largest known dwarf planet?
Ceres, discovered Jan. 1, 1801 by Piazzi. He and other astronomers were looking for the "missing" planet that "ought" to exist between the orbits of Mars and Jupiter. Ceres is about 900 km in diameter.
What planet is the furthers off the plane of the ecliptic?
Eris is tilted at an angle of about 44 degrees to the ecliptic. Although it is considered a dwarf planet.
How big can a black dwarf planet get?
A black dwarf is not a planet; it is the remnant of a long dead star that has cooled. A black dwarf would range from about 7,000 to 17,000 miles in diameter.
What is Oldest dwarf planet?
The oldest dwarf planet is Ceres. See related links for more information.
Is Ceres a planet if not what is it?
Ceres is considered a dwarf planet, not a full-fledged planet. It is the largest object in the asteroid belt between Mars and Jupiter.
Is a black dwarf star smaller than a planet?
A black dwarf would be about the same size as a terrestrial planet such as Earth, so it would be larger than some planets but smaller than others.
Is Ceres a ringed planet?
Ceres is a dwarf planet [See related question] and does not have rings.
What is Pluto the dwarf planet an example of?
Pluto the dwarf planet is an example of of a dwarf planet.
Is Eris a planet?
No, Eris isn't a planet, it is a dwarf planet. See the related question "What is a dwarf planet?" for more details on the differences. Eris is the largest known dwarf planet in the solar system and the ninth-largest body known to orbit the sun directly. No Iris is a satellite.
What is the biggest dwarf planet?
The biggest dwarf planet in our solar system is Pluto. It was considered the ninth planet until 2006, when it was reclassified as a dwarf planet by the International Astronomical Union. Pluto has a diameter of about 1,473 miles (2,370 kilometers).
Why is mercury a dwarf- planet?
Mercury is not a dwarf planet. It is a planet.
What type of planet is dwarf planet?
dwarf is a dwarf planet because it is to small to be in the solar system.,
What is the other name of 134340?
The dwarf planet Pluto.The dwarf planet Pluto.The dwarf planet Pluto.The dwarf planet Pluto.
What is larger a black dwarf or a planet?
A black dwarf would be smaller than some planets but larger than others. A black dwarf is simply a cooled white dwarf. White dwarfs range from slightly smaller than Earth to about twice Earth's diameter.
