NGC 4414: A Flocculent Spiral Galaxy
apod.nasa.gov/apod/image/2504/…
How much mass do flocculent spirals hide? The featured image of flocculent spiral galaxy NGC 4414 was taken with the Hubble Space Telescope to help answer this question. Flocculent spirals -- galaxies without well-defined spiral arms -- are a quite common form of galaxy, and NGC 4414 is one of the closest. Stars and gas near the visible edge of spiral galaxies orbit the center so fast that the gravity from a large amount of unseen dark matter must be present to hold them together. Understanding the matter and dark matter distribution of NGC 4414 helps humanity calibrate the rest of the galaxy and, by deduction, flocculent spirals in general. Further, calibrating the distance to NGC 4414 helps humanity calibrate the cosmological distance scale of the entire visible universe.
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Altbot
Als Antwort auf Josh Universe • • •The image depicts a close-up view of a textured surface, likely from a celestial body such as Mars. The surface is predominantly a uniform sandy brown color, with various shades indicating different elevations and textures. The surface features numerous small craters and pits, with some areas appearing smoother and others more rugged. The overall appearance is rough and uneven, with a circular frame highlighting the detailed texture. The background is black, emphasizing the surface's features.
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