Death of the Universe
GIF at 11!
The stars, nebulae and galaxies are cooling off, leading to the death of the universe. This is an amateur astronomy shot of the Horsehead Nebula, taken by Rawastrodata. Used by permission and with Creative Commons License.
While I was out learning how to manipulate the universe inside the Digistar 5 last week, a news story broke about how the universe is slowly dying. Astronomers are doing a survey of galaxies of all shapes and sizes in 21 wavelengths of light, and have discovered that the energy being produced by stars, nebulae, and galaxies in a surveyed portion of the cosmos is about half of what it was just two billion years ago.
Yes, you read that right: the energy emitted is MUCH less than it was in the past. (For reference, the universe is 13.7 billion years old, or thereabouts.) The team looked at more than 200,000 galaxies to come to their conclusion that the universe is settling back for long, quiet old age as it slowly fades away.
The news that the universe is riding off into the sunset (sort of), is not new news. It’s been on scientists’ minds since the 1990s, but this recent survey is the most detailed look at just how much it is fading and how widespread the dimming down is across the cosmos.
How Long Will It Take?
So, now that we know the universe is dying, the big question is, how long will it take to completely cool and die? The best answer I could find among several places that discuss the end-game of the universe puts it at quintillions of years from now. Between now and then, all the stars will eventually die, dimming out the galaxies. The clouds of gas and dust that make up stars (and planets) will be used up, leaving no building blocks for new stars. Some theorists suggest that there will be a time when only black holes will dominate the universe, making the end state of the cosmos a truly Dark Era.
So, the slowly cooling universe will outlive us all, and likely exist long after all in the cosmos is gone (or evolved to something else). But eventually, the cosmos will be cold and dead. It’s a tough scenario to imagine. But, it makes sense; all things must eventually cool down, slow down, and come to a halt. Even the universe.
The story of our dying universe reminds me of a great science fiction story by Isaac Asimov, called The Last Question. It explores this very idea, but through the eyes of a cosmic computer that continues to ask the same question throughout cosmic time: “How can the net amount of entropy of the universe be massively decreased?” (In other words, can the second law of thermodynamics be reversed? (It states that entropy always increases. Read more about it here.)
I won’t give away the answer, so go find the story for yourself and enjoy! Dr. Asimov created a wonderful thought experiment that goes right along with our newly expanded view of the universe’s impending (and far in the future) death.
The post Death of the Universe appeared first on .
Source: http://thespacewriter.com/wp/2015/08/19/death-of-the-universe/
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Whistler Blowers, Insiders
Definitely interesting for sure. Who’s to say the universe can not have a grand minimum like our sun? The one line most accurate for me was:
“Some theorists suggest that there will be a time when only black holes will dominate the universe, making the end state of the cosmos a truly Dark Era”.
I have been blogging this for years. “I believe “A” black hole will be the last thing in the entire universe before it all starts all over again. I wish I could work out the math on this. A black holes job is to hunt for stuff. Like all the matter around it in it’s own galaxy plus the natural attraction put out by its powerful magnetic core. Black holes will eventually hunt each other down becoming just 1 huge powerful magnetic core. Once it consumes the last bits of matter in the universe and all that is left but just a black hole, it will suck in void space itself. Space is way more powerful than the black hole which will only consume so much empty space before it can no longer pull against its powerful opponent. At that point the power of the black hole is extinguished and so is its hold on all that matter. The big bang begins again along with a new universe. Through this process, and due to the ultra vast distances in space, smaller less massive black holes that have devoured the matter around it continue drifting through space looking for new matter. How ever, some of these black holes may not survive their hunt for more matter and lose out to the raw power of space and implode releasing all its contained matter. Would it be necessary to have all the black holes gone and only 1 left? No I don’t think so. For all we know, several big bangs might have occurred independently in far away separated regions of space and the complete death of the entire universe at one time might be impossible.