The SMC is further out, at , light years. The SagDEG wasn't discovered until , both because it is very dim, and because it was obscured by the central part of our galaxy. Though this galaxy is quite big about 10, light years across , it will likely be disrupted by the tidal forces from the Milky Way Galaxy. For comparison, our galaxy is , light years across. It is 50, light years away from the center of the Milky Way - it is so close to us, that some of the SagDEG's stars are actually in the outermost regions of the Milky Way!
The representation of the SagDEG on the "Nearest Galaxies" image is just an artist's interpretation - the only real image we have shows the galaxy in the radio wavelength. Below is this image, and one that shows its position relative to the Milky Way:. The Canis Major Dwarf Galaxy is only 25, light years from the Sun, and 42, light years from the Galactic center. It too, is well-hidden by the dust in the plane of the Milky Way - which is why it wasn't discovered until recently. That's because of relativistic "time dilation", as explained here.
Chris studies the large scale structure of the universe using the peculiar velocities of galaxies. Home The Universe Galaxies. Traveling at light speed, how long would it take to get to the nearest galaxy? This page was last reviewed on January 28, About the Author Christopher Springob Chris studies the large scale structure of the universe using the peculiar velocities of galaxies. Similar Questions that might Interest You Could someone travel the universe in his or her own lifetime?
Beginner Do we really observe the edges of galaxies at different epochs? Advanced Why doesn't light from distant galaxies reach us instantaneously?
Intermediate Can two galaxies move away from each other faster than the speed of light? Random Question. Could you live near a black hole? Most Recent. Is speed of light the same everywhere? This complex, ringlike structure — which is sometimes referred to as the Monoceros Ring — wraps around the galaxy three times. It was in the course of investigating this ring of stars, and a closely spaced group of globular clusters similar to those associated with the Sagittarius Dwarf Elliptical Galaxy, that the Canis Major Dwarf Galaxy was first discovered.
The current theory is that this galaxy was accreted or swallowed up by the Milky Way Galaxy. Other globular clusters that orbit the center of our Milky Way as a satellite — i. Prior to its discovery, astronomers believed that the Sagittarius Dwarf Galaxy was the closest galactic formation to our own. At 70, light years from Earth, this galaxy was determined in to be closer to us than the Large Magellanic Cloud LMC , the irregular dwarf galaxy that is located , light years from Earth, and which previously held the title of the closest galaxy to the Milky Way.
This collaborative astronomical mission, which took place between and , relied on data obtained by the Mt. Infrared astronomy takes advantage of advances in astronomy that see more of the Universe, since infrared light is not blocked by gas and dust to the same extent as visible light.
Because of this technique, the astronomers were able to detect a very significant over-density of class M giant stars in a part of the sky occupied by the Canis Major constellation, along with several other related structures composed of this type of star, two of which form broad, faint arcs as seen in the image close to the top. The prevalence of M-class stars is what made the formation easy to detect. However, they shine very brightly in the infrared, and appeared in great numbers.
The presence of black holes at the centres of these objects is thought necessary by many astronomers to explain their nature. Because they are the brightest objects known in the universe it is not surprising that quasars are the objects that have been traced out furthest from us.
The furthest known are so far away that the light we see coming from them must have originated when the Universe was only one tenth of its present age. The Universe probably contains more than thousand million billion or galaxies. Visit Us. Search Want to search our collection?
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