Astronomy: space conquest and the latest news from the stars

General scientific debates. Presentations of new technologies (not directly related to renewable energies or biofuels or other themes developed in other sub-sectors) forums).
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Re: Astronomy: Space Conquest and Latest Star News




by Remundo » 20/09/23, 21:37

This all leaves me a little wondering...

the big concern is that a large part of the distant Universe does not emit light, at least it has not had time to reach us.

the age of the Universe is estimated to be about 14 billion years, the farthest visible stuff is 14 billion light years away.

beyond that, how can I say the limits of the Universe, for me it's impossible. The video talks about 93 billion light years, why not 200 or 88? Why not an infinite void?

Speculation.

In my opinion there are a lot of things that we do not understand, and even the human concepts of time and space, and matter are perhaps theoretical tools that mislead us!

We have more or less understood celestial mechanics, the progressive structuring of matter into galaxies-suns-planets, but when we try to explain the origins of the Universe, and even simply its current limits, we find ourselves stuck.
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Re: Astronomy: Space Conquest and Latest Star News




by izentrop » 21/09/23, 00:31

Remundo wrote: The video talks about 93 billion light years, why not 200 or 88? Why not an infinite void?
It is the estimated diameter of the observable universe, taking into account the speed of expansion of space https://fr.wikipedia.org/wiki/Univers_observable#Taille
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Re: Astronomy: Space Conquest and Latest Star News




by Remundo » 21/09/23, 00:54

oh well, we can see 93 billion light years away? Even half?
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Re: Astronomy: Space Conquest and Latest Star News




by izentrop » 21/09/23, 01:51

We don't see it, we deduce it with the Huble constant and the shift of light towards red... We see the object as it was 13.7 billion light years ago, but since universe has expanded due to the effect of "dark energy"...
It's another question how geometrically distant the objects from which we receive light are now, 13,8 billion years after they emitted it. To determine this distance, it is necessary to adopt a model of the universe and, knowing the speed of expansion of space, deduce the distance from which the object considered has moved since the emission of the photons. Under the standard model of cosmology, the current distance to the cosmological horizon is of the order of 46,5 billion light years. The diameter of the observable Universe is estimated at approximately 93 billion light years, or 8,8 × 1023 km (8,8 × 1026 m)14,15, or 880 billion billion kilometers.
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Re: Astronomy: Space Conquest and Latest Star News




by Remundo » 21/09/23, 08:35

yes yes we can speculate.

I prefer to say that we don't know.
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Re: Astronomy: Space Conquest and Latest Star News




by izentrop » 21/09/23, 09:15

The standard cosmological model is like the standard model of particles, these are theories which are confirmed day by day, but do not come together. Researchers haven't finished looking : Wink:
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Re: Astronomy: Space Conquest and Latest Star News




by izentrop » 16/11/23, 14:19

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Re: Astronomy: Space Conquest and Latest Star News




by Christophe » 19/11/23, 02:57

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Re: Astronomy: Space Conquest and Latest Star News




by izentrop » 19/11/23, 03:14

Interesting this story of methyl bromide (CH3Br), but it makes you think too much of that...
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Re: Astronomy: Space Conquest and Latest Star News




by izentrop » 02/01/24, 02:22

Fireworks for the New Year on our star ...

https://www.lindependant.fr/2024/01/01/ ... 672007.php

The Juno probe today flew past the volcanic moon Io at an altitude of 2800 km.


On Mars with Perseverance...
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