| Black hole: the "double nucleus" of the Andromeda galaxy |
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A new image taken by the Hubble space telescope points to the black hole of the Andromeda Galaxy (M31), the only galaxy visible to the naked eye other than the Milky Way (Formerly, the Milky Way does not meant that the whitish band crossing the night sky. There are several mythological interpretations of the Milky Way. With advances in astronomy, one ...) and only other galaxy giant (asymptotic giant branch, white dwarfs, and planetary nebulae) of our local group (The local group is the set of thirty galaxies belongs to our Galaxy. Its diameter is about 3 million parsecs).
This is the clearest image visible light (visible light, also called
visible spectrum or optical spectrum is the portion of the
electromagnetic spectrum that is visible to the human eye.) taking the
nucleus of an external galaxy. The horizon (Conceptually, the horizon
is the limit of what can be observed, due to its own position or
situation. This simple concept is available in physics, philosophy,
literature, and many other areas:) events, the closest region around the
black hole from which the light (light means electromagnetic waves
visible to the human eye, that is to say, included in the wavelengths
from 0.38 to 0, ... 78) can still escape, is too small to be seen, but
it is located near the center of a cluster of compact blue stars.
This
cluster is surrounded by the large "double nucleus" of M31, discovered
by the telescope (a telescope (from the Greek tele means "far" and
skopein meaning "look see") is an optical instrument that allows ...)
Hubble ( The Hubble Space Telescope (English, Hubble Space Telescope, or
HST) is a telescope orbits about 600 km altitude, it performs a full
rotation of the Earth every 100..) in 1992. The double nucleus is in
fact an elliptical ring of old red stars orbiting the black hole, but
more distant than the blue stars. When the stars are at the point
(Graphic) farthest from their orbit, they move more slowly, a bit like
cars (A car, or car, is a land vehicle is propelling itself with a
engine. This vehicle is designed for ground transportation of persons or
...) on a highway (a highway is a road reserved for motor vehicle
traffic speed (cars, motorbikes, trucks) and for which there can
circulate ... a) saturated. This gives the illusion of a second core.
The blue stars surrounding the black hole are not older than 200 million years, and must have formed nearby in a sudden burst of star formation. These blue stars have a massive short-lived if they had not had enough time (Time is a concept developed to represent the variation of the world: the universe is never fixed, the elements that compose.) move to migrate toward the black hole if they had formed elsewhere. Astronomers are trying to understand how these apparently young stars formed in such a way so deep within the gravitational influence the black hole and how they survive in this environment (the environment is all around us. It all natural and artificial elements within which human life takes place. With the current ecological issues, environment .. the term) extreme. The fact that young stars are also closely linked to the central black hole of our own galaxy suggest that this may be a common phenomenon in spiral galaxies. |
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