This galaxy is located 300 million light-years away, but the star to the right is much closer to Earth.Spiral galaxy NGC 5495 in the constellation Hydra. (Image credit: ESA/Hubble & NASA, J. Greene. Acknowledgement: R. Colombari)
The Hubble Space Telescope captured the sight of a beautiful spiral galaxy, adorned with the sparkle of two nearby stars.
Galaxy NGC 5495 lies 300 million light-years from Earth, far behind the jewel-like celestial bodies to the top-left of the galaxy’s center, and another to the right. These are stars within the Milky Way, Earth’s home galaxy that, like NGC 5495, is a spiral galaxy.
According to the European Space Agency (ESA) — which wrote a description of the “stately sweeping spiral arms” of the galaxy in a new NGC 5495 image (opens in new tab) published on Sept. 26 — 60% of galaxies are spiral galaxies (opens in new tab). This means that most of the stars in the universe are contained within a galaxy like our own, or like the one seen in the new Hubble image.
ESA officials write that NGC 5495 is a Seyfert galaxy (opens in new tab). These are galaxies with activity at their core. The most extreme version of an active galactic nucleus (opens in new tab) (AGN), called a quasar, is the brightest object in the known universe. This sort of glowing galactic heart is powered by the might of a supermassive black hole, which astronomers believe lie at the center of most if not all galaxies in the cosmos.
When these gravity pits accrete a lot of material around its outside, the material heats up and begins to glow. Galaxy NGC 5495 isn’t in the quasar category, but it’s still considered a churning AGN.
A Hubble Space Telescope image of spiral galaxy NGC 5495 in the constellation Hydra. (Image credit: ESA/Hubble & NASA, J. Greene. Acknowledgement: R. Colombari)
Galaxy NGC 5495 is also lovely to behold because it’s conveniently oriented face-on, allowing its core and spiral arms to be clearly visible. Although it’s not too visible from this perspective, spiral galaxy NGC 5495 is probably enveloped in a halo that lies just above and below the galactic disk. For reference, a halo is the hazy glow that sandwiches the band of the Milky Way that appears in the night sky.
Astronomers think spiral galaxies eventually evolve (opens in new tab) into elliptical galaxies, bodies with older stars and less gas.
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