Starship Asterisk*

ValiantSL wrote:The question is: Is it possible, that the galaxy turned in such a way that the filaments,usually seen in photographs, are influanced by that timespan of 100.000 years.

rstevenson wrote:I think the OP was asking about Light-time correction. The only reason I know anything about it is that I read the Aberration article at Wikipedia that you linked to, and the one I'm linking to is mentioned there.

If I'm reading that article correctly, it would seem the Light-time_correction effect on our view of a galaxy would be essentially nil. Certainly not enough to cause the appearance of spirals, as I think the OP was wondering.

Chris Peterson wrote:

rstevenson wrote:I think the OP was asking about Light-time correction. The only reason I know anything about it is that I read the Aberration article at Wikipedia that you linked to, and the one I'm linking to is mentioned there.

That might be a better term, although I'd be inclined to qualify it the same way I did aberration of light, which is to say that the phenomenon described by the OP is related to light-time correction. What we're seeing depends on a comparison of the effects of transverse motion of two sources at different distances.

http://en.wikipedia.org/wiki/Aberration_of_light wrote:
<<The aberration of light (also referred to as astronomical aberration or stellar aberration) is an astronomical phenomenon which produces an apparent motion of celestial objects about their real locations. It was discovered and later explained by the third Astronomer Royal, James Bradley, in 1725, who attributed it to the finite speed of light and the motion of Earth in its orbit around the Sun. At the instant of any observation of an object, the 0apparent position of the object is displaced from its true position by an amount which depends solely upon the transverse component of the velocity of the observer, with respect to the vector of the incoming beam of light (i.e., the line actually taken by the light on its path to the observer). The result is a tilting of the direction of the incoming light which is independent of the distance between object and observer. Aberration should be distinguished from light-time correction, which is due to the motion of the observed object, like a planet, through space during the time taken by its light to reach an observer on Earth. Light-time correction depends upon the velocity and distance of the emitting object during the time it takes for its light to travel to Earth. Light-time correction does not depend on the motion of the Earth—it only depends on Earth's position at the instant when the light is observed. Aberration is usually larger than a planet's light-time correction except when the planet is near quadrature (90° from the Sun), where aberration drops to zero because then the Earth is directly approaching or receding from the planet. At opposition to or conjunction with the Sun, aberration is 20.5" while light-time correction varies from 4" for Mercury to 0.37" for Neptune (the Sun's light-time correction is less than 0.03").>>

ValiantSL wrote:The question is: Is it possible, that the galaxy turned in such a way that the filaments,usually seen in photographs, are influanced by that timespan of 100.000 years.