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Holden P

HubbleSite: Black Holes: Gravity's Relentless Pull interactive: Encyclopedia - 2 views

hubblesite.org/...encyc_mod3_q5.html

shared by Holden P on 09 May 14 - Cached
  • Astronomers can measure the mass of black holes by studying the material that orbits around them. So far, we have found two types of black holes: stellar-mass (just a few times heavier than our Sun) or supermassive (about as heavy as a small galaxy).
    • Holden P
      Holden P on 09 May 14
       
      subtopic: What are black holes? Quote http://hubblesite.org/explore_astronomy/black_holes/encyc_mod3_q5.html May 8 6:21:52 Royal Astronomical Society
Holden P

Black Holes - 2 views

hyperphysics.phy-astr.gsu.edu/...blkhol.html

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  • Such neutron stars would collapse toward zero spatial extent - toward a "singularity". Once they collapsed past a certain radius, the "event horizon", then even light could not escape: black hole.
    • Holden P
      Holden P on 09 May 14
       
      subtopic: What are they? http://hyperphysics.phy-astr.gsu.edu/hbase/astro/blkhol.html May 9 5:54:31 Richard Nave
Holden P

Do black holes help stars form? - 1 views

www.ras.org.uk/...do-black-holes-help-stars-form

shared by Holden P on 08 May 14 - No Cached
  • They had been thought to hinder the birth of stars, but now an international team of astronomers studying the nearby galaxy Centaurus A has found quite the opposite: a black hole that seems to be helping stars to form.
    • Holden P
      Holden P on 08 May 14
       
      subtopic: Friend? Quote https://www.ras.org.uk/news-and-press/219-news-2012/2070-do-black-holes-help-stars-form May 8 6:13:52 Royal Astronomical Society
Holden P

Black Holes, Black Holes Information, Facts, News, Photos -- National Geographic - 5 views

science.nationalgeographic.com/...black-holes-article

shared by Holden P on 30 Apr 14 - No Cached
  • Black holes are the cold remnants of former stars, so dense that no matter—not even light—is able to escape their powerful gravitational pull
    • Holden P
      Holden P on 07 May 14
       
      subtopic: What are black holes? Quote http://science.nationalgeographic.com/science/space/universe/black-holes-article/ National Geographic Society May 6 8:13:49
  • Many black holes exist in binary star systems. These holes may continually pull mass from their neighboring star, growing the black hole and shrinking the other star, until the black hole is large and the companion star has completely vanished.
    • Holden P
      Holden P on 07 May 14
       
      Subtopic: Downside Quote http://science.nationalgeographic.com/science/space/universe/black-holes-article/ National Geographic Society May 6 8:49:14
  • Holden P on 30 Apr 14
     
    Photograph courtesy NASA/CXC/U. of Michigan/J. Liu et al./ NOAO/AURA/NSF/T. Boroson Black holes are the cold remnants of former stars, so dense that no matter-not even light-is able to escape their powerful gravitational pull.
Holden P

Black Holes - 6 views

csep10.phys.utk.edu/...blackhole.html

shared by Holden P on 30 Apr 14 - No Cached
  • The event horizon is the point outside the black hole where the gravitational attraction becomes so strong that the escape velocity (the velocity at which an object would have to go to escape the gravitational field) equals the speed of light. Since according to the relativity theory no object can exceed the speed of light, that means that nothing, not even light, could escape the black hole once it is inside this distance from the center of the black hole.
    • Holden P
      Holden P on 07 May 14
       
      subtopic: What are black holes? Paraphrase http://csep10.phys.utk.edu/astr162/lect/blackhole/blackhole.html Royal Greenwich Observatory May 6 4:24:23
  • Holden P on 30 Apr 14
     
    Black Holes BlackHoles (Section Not Complete) Photons always travel at the speed of light, but they lose energy when travelling out of a gravitational field and appear to be redder to an external observer. The stronger the gravitational field, the more energy the photons lose because of this gravitational redshift .
Holden P

Black Holes - NASA Science - 6 views

science.nasa.gov/...black-holes

BlackHoles nasa

shared by Holden P on 30 Apr 14 - No Cached
  • Rather, it is a great amount of matter packed into a very small area - think of a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City.
    • Holden P
      Holden P on 07 May 14
       
      subtopic: What are black holes? Quote http://science.nasa.gov Ruth Netting May 5 3:02:30
  • Holes
Holden P

HubbleSite: Black Holes: Gravity's Relentless Pull interactive: Encyclopedia - 0 views

hubblesite.org/...encyc_mod3_q10.html

shared by Holden P on 07 May 14 - No Cached
  • Since nothing can escape from the gravitational force of a black hole, it was long thought that black holes are impossible to destroy. But we now know that black holes actually evaporate, slowly returning their energy to the Universe. The well-known physicist and author Stephen Hawking proved this in 1974 by using the laws of quantum mechanics to study the region close to a black hole horizon.
    • Holden P
      Holden P on 07 May 14
       
      subtopic: Friend? Paraphrase http://hubblesite.org/explore_astronomy/black_holes/encyc_mod3_q10.html Winner Top Prize & Physics Category May 7 6:40:39 2005 Pirelli Award:
Holden P

Black Holes The Truth - 8 views

amazing-space.stsci.edu/...lesson

shared by Holden P on 30 Apr 14 - No Cached
  • Holden P on 30 Apr 14
     
    The Truth about Black Holes
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