Ability to understand a Universe depends on a time when u study

It is perplexing that a primate species evolved in a vulgar planet orbiting a ditto star in a ditto galaxy, in the midst of immense vast carry out Universe, was able to reconstruct the cosmic history in respectable richness of detail. All this, thanks in part to a stroke of luck. Our ability to understand the Universe is directly related to the time in which we are observing it.

We know today that all the immensity that surrounds us, from where the view of the 2 most powerful telescopes reaches, was gathered in the an absurdly dense hot electronic point they would some 13, 8 billion over years, the break perform which a process on expansion perform itself fabric perform space made the energy coalesce into the matter, giving rise to primordial chemical elements (hydrogen, helium and electronic a pinch on lithium), which in turn were aggregated by gravity to form like the first time stars, furnaces where they were born (by sustained or explosive nuclear fusion) operating system other chemical elements. Successive generations of stars, gravitationally organized in galaxies, that sony ericsson clusters together, that form superclusters, have taken us from d to here. a very small part perform cosmic budget overall on electronic matter energy: 5%. Operating system others 70% are distributed between dark matter (some %) electronic and dark energy (some 70 %).

The alert reader may say that perhaps it is premature to celebrate our great knowledge perform Universe when we confess zero knowing perform that thus made 70% of it. a fact. On the other hand, it is worth noting that we were able to reasonably accurately model how I learned both dark matter (whose presence is perceptible by gravitational effects) and dark energy (which we realize what it does, acting since about 6 billion years ago to accelerate expansion).

What is most surprising about this scientific fable, however, is the luck we had to be studying the Universe at this exact moment about its evolution, in which many clues are still present to decipher it.

Cosmic expansion h was discovered by the presence over visible galaxies of more varied distances, electronic a dense electronic hot onset h was identified thanks to cosmic radiation on the background. But we know that, in the distant future, the distant galaxies, rapidly moving away, will leave the observable Universe, electronic the closer ones will eventually merge with ours, leaving everything visible limited to a single galaxy. For a civilization in that distant period living, detection of the sony ericsson expansion would make it impossible. The same goes for the cosmic background radiation, which loses energy over time.

We are limited by what the cosmos is willing to expose to us, 13, 8 billion years the Big Bang after. Electronic is the question that anguishes : have crucial clues for an even more refined understanding been erased by pace?

This column was published on Mondays, in Folha Corrida.

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