Hoag's object is an unexplainable mystery in space
The mysterious discovery of Arthur Hoag
Is there any explanation?
Hoag’s object is a mystery in space/ Ph.Pexels@Alex Andrews[/caption]
Hoag's object is the serpent constellation in the northern sky, which is called a galaxy within a galaxy within a galaxy. Although it has been discovered for nearly 70 years, no one could explain why it exists.
The mysterious discovery of Arthur Hoag
This cosmic turducken was discovered by astronomer Arthur Hoag in 1950. That is why it was named after him. Hoag’s object is a ring-shaped galaxy which is rare in the space. It measures some 100,000 light-years across and is located 600 million light-years from Earth. The Hubble Space Telescope has taken some images of the oddball object recently and has them processed by geophysicist Benoit Blanco. In the photos, a bright ring of billions of blue stars forms a perfect circle around a much smaller and denser sphere of reddish stars. You can also see another ring galaxy in the dark gap between the two stellar circles which is much farther away from us.
Is there any explanation?
Astronomers still can’t explain what's going on and what tore Hoag's object in two. The ring galaxies account for less than 0.1% of all known galaxies. Therefore, it is not easy to study these objects. One suggestion from Hoag was that the galaxy's peculiar ring formation was merely an optical illusion caused by gravitational lensing. This is an effect occurring when extremely high-mass objects bend and magnify light. But this idea was disproved by later studies with better telescopes.
Another suggestion was that Hoag's object was once a more common, disk-shaped galaxy. It was then ripped a hole by an ancient collision with a neighboring galaxy and so permanently warped its gravitational pull. However, there has been no evidence for such a collision in the last 3 billion years, as astronomers have been looking through radio telescopes to see some of the fallout from the accident. So if a cosmic crash at the core of Hoag's object is true, then it must have happened so long ago and all the evidence has been swept away. Hoag's object is still a mystery.
Hoag's object is an unexplainable mystery in space
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