Astronomy

Interesting study on the biological importance of UV-rays. It is part to what I call "finding the way to the celestial India" because this all reminds me so much of the aims of the Great Navigations, when the Europeans found there way around in the oceans and eventually discovered other continents.

Ultra-violet light is particularly important for humans just as it says in the universe today website: https://www.universetoday.com/137023...hout-universe/

To be sure!
Here is another recent article that impressed me:

What lit up the universe? Black holes may have punctured darkened galaxies, allowing light to escape

Date:
August 30, 2017

Source:
University of Iowa
Summary:

Researchers have a new explanation for how the universe changed from darkness to light. They propose that black holes within galaxies produce winds strong enough to fling out matter that punctures holes in galaxies, allowing light to escape.
https://www.sciencedaily.com/release...0830114800.htm

Well, that was an unusual theory. We need more research to buttress the theory.

And here it comes:
Universe Today has two postings on the Milky Way's massive double black holes, and a theory of how the universe became filled with light, many eons after the Big Bang:

https://www.universetoday.com/137062...und-milky-way/

https://www.universetoday.com/137048...-filled-light/

Universe Today has two postings on the Milky Way's massive double black holes, and a theory of how the universe became filled with light, many eons after the Big Bang:

https://www.universetoday.com/137062...und-milky-way/

https://www.universetoday.com/137048...-filled-light/

Amazing! The swallowing black holes as a source of universal light! And the study seems to be recent. Summing it up:
"As Philip Kaaret, a professor in the UI Department of Physics and Astronomy and the lead author on the study, explained:

'The observations show the presence of very bright X-ray sources that are likely accreting black holes. It’s possible the black hole is creating winds that help the ionizing radiation from the stars escape. Thus, black holes may have helped make the universe transparent.'
And again:
“As matter falls into a black hole, it starts to spin and the rapid rotation pushes some fraction of the matter out. They’re producing these strong winds that could be opening an escape route for ultraviolet light. That could be what happened with the early galaxies.”
https://www.universetoday.com/137048...-filled-light/

Yes, its amazing how much we are starting to learn about these odd things like black holes and the Milky Way and how it is changing and evolving.

The evolution of the Milky Way, if this theory is correct, puts an extra dimension on evolution. Gives a history to what happened next.

Yes, I read that article too. What gets me most is the imaginative power that is behind all those researches. I think that is the point that links this tread to literature. I am very glad you opened it, because I am learning a lot about the interplanetary world.

Yes, it is very complex out there. Fascinating, too!

The next post on universetoday.com follows up on the previous post. Quasars:

"Back in the 1950s, astronomers scanned the skies using radio telescopes, and found a class of bizarre objects in the distant Universe. They were very bright, and incredibly far away; hundreds of millions or even billion of light-years away. The first ones were discovered in the radio spectrum, but over time, astronomers found even more blazing in the visible spectrum.

The astronomer Hong-Yee Chiu coined the term “quasar”, which stood for quasi-stellar object. They were like stars, shining from a single point source, but they clearly weren’t stars, blazing with more radiation than an entire galaxy."

The rest of the post needs also to be read:

https://www.universetoday.com/137069...es-came-first/

Thanks, DW.

Here is a related article. Black holes are definitely the current "stars":

https://www.sciencedaily.com/release...0901135518.htm

sciencedaily.com looks to be a good site to follow...

There are four or five similar astronomy sites. Here is another one:

https://phys.org/space-news/astronomy/

Yes, its getting to the point where we have to choose which site(s) to follow.