Astro-Images | Mice-Edges-Birth

Follow the astro-images tab above to see previous posts including this how-to.


 

NGC 4676

This colliding pair is about 300 million miles away. Computer simulations say we are seeing two nearly identical spiral galaxies about 160 million years after they started colliding. Collision of galaxies is not like a car collision. Very little material actually hits other material. It is more of a distorting gravitational interaction. The long arm to the upper left is actually curved, but looks straight because we see it edge-on. They will merge and form a spherical elliptical galaxy. The blue regions are places where young hot new stars are forming.

Click the image to see a much larger version showing a multitude of tiny more distant galaxies all over the field of view.

NGC4676

From original grayscales | Hubble Legacy Archive | J. Ruebush

NGC 5866

The NASA Hubble Space Telescope view of this disk galaxy is nearly edge-on to our line-of-sight. A dark dust lane divides the galaxy into two halves. The image shows a subtle central bulge around a bright nucleus. Imagine two dinner plates with one upside-down on top of the other.

NGC5866

 

NGC 4449

This dwarf and disorganized galaxy is 12.5 million light-years away. There are hundreds of thousands of blue and red stars in this Hubble Space Telescope image. Hot blue clusters of massive stars are scattered around the galaxy. New star birth regions show as reddish regions. Clouds of gas and dust are silhouetted against the starlight.

NGC 4449 has a high rate star formation. The gas supply that feeds the star birth will only last for another billion years or so.

NGC4449

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11 thoughts on “Astro-Images | Mice-Edges-Birth

  1. Although space scares me, I adore images of it. In science class I always enjoyed the effect of looking at the world through a microscope, then the opposite spectrum, the telescope. If you listen, I believe you can hear the song of the universe.

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  2. I also think space is kind of eerie, although these events happen light years away, it’s like learning all of what could actually happen here, and that we are part of it, although there is this ‘space-time’ factor with events happening here; then somewhere else light years away. We have to deal with our own concept of time, and that sure is enough as it is.

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      • I guess my question is whether a black hole is an area where ‘time-space’ ceases to exist. If so, why would it have an ‘event horizon’? Can the telescopes reach so far?

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      • Passage of time slows for events in the presence of strong gravity fields. That is a testable phenomenon and has been demonstrated. Black holes create extremely strong gravity fields that slow time to essentially a stand-still.

        Light speed is not fast enough to escape from the grip of a black hole at the event horizon. Telescopes can see the activity very near the event horizon as the material swirls around the black hole. No light can escape from a black hole for a telescope to see.

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      • Thank you for your good questions. I will give short answers if you don’t mind.

        I do believe black holes exist and are some of the most intriguing objects in the universe. They take us to the edge of our understanding.

        Hawking Radiation seems to be an accepted concept by cosmologists.

        I try to stay away from Event Horizons. Once you go over them, there is no coming back. 🙂

        Of course, these things will never be directly tested. We cannot get near enough to them. If some cosmic event takes place that we can watch from beginning to end, we may gain better understanding. That would be great.

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  3. What I understood by ‘Hawking Radiation” is that it was actually a concept that challenged his whole theory (Stephen Hawking), making the black hole seem entirely different from when he first explained it. Is this correct?

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    • HR theory was proposed to take into account some aspects of quantum physics. (I am not an expert in this) It theorized that black holes would radiate away energy and eventually ‘evaporate’. That is contrary to the idea that they last forever. For a large massed black hole, that would take an enormous amount of time. Not something we can wait for to see it happen. None have ever been observed so far.

      Maybe the Large Hadron Collider at CERN will make small massed short-lived black holes where this phenomenon can be directly observed. Time will tell.

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