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Hubble Snaps Spiral’s Profile

Hubble image of ngc 3717
Hubble image of ngc 3717. Bright center of galaxy shrouded by dust and gas
ESA/Hubble & NASA, D. Rosario

The NASA/ESA Hubble Space Telescope sees galaxies of all shapes, sizes, luminosities and orientations in the cosmos. Sometimes, the telescope gazes at a galaxy oriented sideways — as shown here. The spiral galaxy featured in this Hubble image 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 disk, giving these galaxies a shape somewhat like that of a flying saucer when they are seen edge-on.

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 disk and the central bulge (of which only one side is visible).

Text credit: ESA (European Space Agency)

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Last Updated
Oct 04, 2023
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