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Hace 22 horas · Since the Andromeda Galaxy is seen close to edge-on, it is difficult to study its spiral structure. Rectified images of the galaxy seem to show a fairly normal spiral galaxy, exhibiting two continuous trailing arms that are separated from each other by a minimum of about 13,000 ly (820,000,000 AU ) and that can be followed outward from a distance of roughly 1,600 ly (100,000,000 AU) from the core.
Hace 22 horas · Dark matter map. In astronomy, dark matter is a hypothetical form of matter that appears not to interact with light or the electromagnetic field.Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen. Such effects occur in the context of formation and evolution of galaxies, gravitational lensing, the ...
