Timeline : Η Γραμμή του Χρόνου

Θέμα: Timeline : Η Γραμμή του Χρόνου 02.10.08 11:40

Timeline

Timeline : Η Γραμμή του Χρόνου Timei

Στη σελίδα αυτή περιηγηθείτε σε μια ενδιαφέρουσα οπτική παρουσίαση

των σημαντικότερων γεγονότων στoν χρόνο και την ιστορία, με περιληπτικές εξηγήσεις για την κάθε περίοδο

με άφθονες παραπομπές σε κύρια άρθρα.

Θέμα: Απ: Timeline : Η Γραμμή του Χρόνου 02.10.08 13:47

The Big Bang

Timeline : Η Γραμμή του Χρόνου Bigbang

There are now three possible models of the universe based on the Big Bang theory.

Firstly is the open Friedmann-Lemaître theory in which hyperbolically curved space is predicted to expand forever.

Second is the closed Friedmann-Lemaître theory in which spherically curved space is predicted to collapse on itself.

Third is the Einstein-de Sitter theory which calculates that the flat space of the universe is also destined to continually expand..

Basic elements form

Timeline : Η Γραμμή του Χρόνου ELEMENTSFORMf

Timeline : Η Γραμμή του Χρόνου ELEMENTSFORMf

Protons and neutrons come together to form the nuclei of simple elements:

hydrogen, helium and lithium.

It will take another 300,000 years for electrons to be captured into orbits around these nuclei to form stable atoms.

Matter domination era

Timeline : Η Γραμμή του Χρόνου Mutter

At this moment, the energy in matter and the energy in radiation are equal.

But as the relentless expansion continues, the waves of light are stretched to lower and lower energy, while the matter travels onward largely unaffected.

At about this time, neutral atoms are formed as electrons link up with hydrogen and helium nuclei.

The microwave background radiation hails from this moment, and thus gives us a direct picture of how matter was distributed at this early time.