Latest Black holes Stories

Star Discovery Tests Einstein
2012-10-04 20:58:20

Lee Rannals for redOrbit.com — Your Universe Online Astronomers, using the Keck Observatory, have found the star they need to test Einstein's theory about the fabric of space-time. UCLA astronomers said they have discovered a star that orbits the enormous black hole at the center of our Milky Way that will help discover whether Albert Einstein was right in his fundamental prediction of how black holes warp space and time. The star, S0-102, orbits the black hole every...

Messier 22 Has Two Black Holes
2012-10-03 12:49:09

Lee Rannals for redOrbit.com - Your Universe Online A surprising black hole discovery made while using the National Science Foundation's Karl G. Jansky Very Large Array (VLA) is causing scientists to change what they know of globular star clusters. Astronomers used VLA to study the globular cluster known as Messier 22, which is a tight-knit collection of hundreds of thousands of stars that lie 10,000 light-years away from Earth. The team had hoped to find evidence for a rare type of...

Merging Black Holes Could Reveal Their Flashy Secrets
2012-09-29 08:09:37

[ Watch the Video: Black Holes Crash, Merge in New Simulations ] April Flowers for redOrbit.com - Your Universe Online Einstein predicted gravitational waves almost 100 years ago. According to his theory, whenever massive objects interact, they produce distortions in the very fabric of space and time that ripple outward across the universe at the speed of light. Modern astronomers have found indirect evidence of these waves, but so far they have eluded direct detection. Greater...

Astronomers Describe Fireworks In The Early Universe
2012-09-27 19:28:13

Lee Rannals for redOrbit.com — Your Universe Online Astronomers suggest, in the Astrophysical Journal Letters, as galaxies formed in the early universe, they were accompanied by fireworks in the form of energy bursts. Active galaxies are easily detected due to their luminous radio, ultraviolet or X-ray radiation, which results from steady accretion onto their massive central black holes. Little has been known about the composition of these galaxies or their relationship to the...

Astronomers Measure Black Hole Radius
2012-09-27 19:16:53

Lee Rannals for redOrbit.com — Your Universe Online An international team of astronomers was able to measure the radius of a black hole for the first time. Researchers measured the radius of a black hole at the center of the galaxy M87, which lies about 50 million light-years away from the Milky Way. M87 has a black hole 6 billion times more massive than the Sun, and the team was able to observe the glow of matter near the edge of the black hole, or the "event horizon," using...

black hole
2012-09-18 05:29:06

April Flowers for redOrbit.com - Your Universe Online Recent research from the University of Cardiff has found that the dying tones of black holes reveal the cosmic crash that caused them to form. Black holes are regions of space where gravity is so strong that not even light can escape. Usually, they are the evolutionary ending of stars that were 10 to 15 times larger than our sun. After these stars undergo a supernova event, sometimes the remnant will collapse in on itself, creating a...

Top Physicists Come To Jerusalem To Mark 40 Years Since Jacob Bekenstein’s Famous Essay On The Entropy Of Black Holes
2012-09-04 09:53:43

Speakers include Nobel laureate and winner of new $3 million physics prize As the scientific community marks 40 years since the publication of Prof. Jacob Bekenstein's famous paper on black hole entropy, the Hebrew University of Jerusalem´s Institute for Advanced Studies is celebrating the occasion by hosting an international conference featuring the world´s top theoretical physicists. The Sep. 3-7 conference, Forty Years of Black Hole Thermodynamics, is presented in cooperation...

X-ray Signal Detected During Black Hole's Destruction Of Passing Star
2012-08-03 15:48:00

[Watch Video] Lee Rannals for redOrbit.com — Your Universe Online Astronomers have identified an X-ray signal that followed an observation made last year of a quiescent black hole in a distant galaxy. The black hole discovered by the team last year was seen erupting after shredding and consuming a passing star. Astronomers then witnessed days following the observation a distinctive X-ray signal that comes from matter on the verge of falling into the black hole. This...

Black Holes Need Diet Rich In Stars To Grow
2012-07-20 12:21:35

Lawrence LeBlond for redOrbit.com - Your Universe Online Researchers from several American institutes and agencies have developed a new model showing how an elusive type of black hole can be formed in the gas surrounding their supermassive counterparts. The scientists, from the American Museum of Natural History (AMNH), the City University of New York (CUNY), the Jet Propulsion Laboratory (JPL) of the California Institute of Technology (Caltech), and the Harvard-Smithsonian Center for...

Latest Black holes Reference Libraries

2004-10-19 04:45:42

Supermassive Black Hole -- A Supermassive black hole is a black hole with a mass in the range of millions or billions solar masses. A supermassive black hole has some interesting properties differing from his low-mass cousins: -- The average density of a supermassive black hole can be very low, and actually can be lower than water's density. This happens because the black hole diameter increases linearly with mass, and consequently density drops much faster. -- Strong tidal...

2004-10-19 04:45:42

Seyfert Galaxy -- Seyfert galaxies are spiral or irregular galaxies containing an extremely bright nucleus, most likely caused by a supermassive black hole, that can sometimes outshine the surrounding galaxy. The light from the central nucleus varies in less than a year, which implies that the emitting region must be less than one light year across. They are named for the astronomer Carl Seyfert, who studied them extensively in the 1940s. They are a subclass of active galactic nuclei....

2004-10-19 04:45:41

Microquasar -- Microquasars are smaller cousins of quasars. They are named after quasars, as they have some common characteristics: strong and variable radio emission often seen as radio jets, and an accretion disk surrounding a black hole. In quasars, the black hole is supermassive (millions of solar masses) as in microquasars, the black hole mass is a few solar masses. In microquasars, the accreted mass comes from a normal star and the accretion disk is very luminous in optical regions...

2004-10-19 04:45:41

Event Horizon -- The event horizon is a boundary beyond which information will never reach an observer. An event horizon is a mathematical construct and not a physical object and a person passing through an event horizon will not notice any odd behavior. From an outside observer however, an object passing though an event horizon will appear redder and dimmer and will appear to freeze at the moment the object passes the event horizon. An event horizon can form around a gravitational...

2004-10-19 04:45:41

Black Hole -- Black holes are objects so dense that not even light can escape their gravity. They are believed to form from the gravitational collapse of astronomical objects containing two or more solar masses. Astronomical observations suggest that the center of most galaxies, including our own Milky Way, contain supermassive black holes containing millions to billions of solar masses. Black holes are predictions of Einstein's theory of general relativity. In particular, they occur...

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