The “powers” button allows you to self delete.

It seems to me that DU doesn't have the ability to link multiple sub-posts to duplicate OPs.

This is one of the reasons I think DU should go to the "tagging" model. Maybe easier said than done.

Or was there another reason?

Some people read general discussion while others may only subscribe to "science." I always read my "pets" subscription, but skip other stuff when I am down or busy. Others may do the same. I see duplicate posts all the time, likely for the same reason.

A lot of times, when there is a delay in a post going through, people hit the post button twice, resulting in duplicate posts that fill up the Latest page unnecessarily.

I deleted the repeat. Thanks.

Homo sapiens need to be told, again and again, that they are not the center of the universe.

Their little neighborhood, state, country, continent, or planet is not what is important. Their sun is just one of trillions. Their galaxy is just one of an uncounted number.

And that this universe may not even be the only one.

The Persian astronomer Abd al-Rahman al-Sufi was the first to document the observation of the Andromeda galaxy in 964 CE.
Granted he did not describe it as a galaxy but as a "small cloud" but it is the first known written observation of a galaxy outside of our own.

Do you have a news report on this? Of course others saw the white fuzz ball in the sky, but Hubble resolved a modern day, long standing question about whether the Milky Way was the entire universe.

Or a belief. Or a theory, That ʿAbd al-Raḥmān al-Ṣūfī documented the first observation of another galaxy. That is what the history of astronomy said happened.
What Hubble did was scientifically prove the existence of other galaxies.
These are different things. I was only mentioning it for both clarity and because historically the work of non-white scientists is often minimized in favor of white scientists.
It was only meant to add more context and history to the body of work.

I agree. So many astronomical discoveries were also made by women, bit I don't recall hearing about them in high school science class either. I attended high school in the early 1970's, but my guess is that everyone but white European men still get left out. 🤔

The majority opinion in the world (but not of scientists) was that the Sun, or Earth, was the center of the universe.

There is no end or beginning, therefore every possibility happens over and over again forever.

You might be interested in Fred Hoyle.

He coined the term "Big Bang" theory in his rejection of it.

Hoyle was buddies with (or at least an acquaintance of...) one of my mentors, a guy who helped me get back into university after I'd been "asked" to take time off a second time.