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File:A Spiral in Profile NGC 3717.jpg

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English: The NASA/ESA Hubble Space Telescope sees galaxies of all shapes, sizes, brightnesses, and orientations in the cosmos. Sometimes, the telescope gazes at a galaxy oriented sideways — as shown here. The spiral galaxy featured in this Picture of the Week is called NGC 3717, and it is located about 60 million light-years away in the constellation of Hydra (The Sea Serpent).

Seeing a spiral almost in profile, as Hubble has here, can provide a vivid sense of its three-dimensional shape. Through most of their expanse, spiral galaxies are shaped like a thin pancake. At their cores, though, they have bright, spherical, star-filled bulges that extend above and below this disc, giving these galaxies a shape somewhat like that of a flying saucer when they are seen edgeon.

NGC 3717 is not captured perfectly edge-on in this image; the nearer part of the galaxy is tilted ever so slightly down, and the far side tilted up. This angle affords a view across the disc and the central bulge (of which only one side is visible).
日期
来源 https://www.spacetelescope.org/images/potw1940a/
作者 ESA/Hubble & NASA, D. Rosario

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Galaxy NGC 3717 taken by Hubble Space Telescope

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NGC 3717

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fc49d66c191db1e9961a45d0441c88ad044b69dd

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4,476,259 字节

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3,789 像素

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4,079 像素

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