de juliol 10, 2012

La delicada interacció entre gravetat i turbulència....

This image, taken by the European Space Agency’s Herschel space Observatory, shows off the delicate interplay between gravity and turbulence in Vela C. Gravitational attraction causes the gas and dust to clump, while random motions move the material around. Together, these forces create the beautiful filaments and delicate structures within the region. A long ridge can be seen winding its way through the center of Vela C, with many smaller strands branching away.
This interaction between gravity and turbulence triggers the formation of stars. When bunches of gas and dust grow large enough, they pull in more and more material, eventually leading to higher density and temperature, which ignites a nuclear furnace to power a star. While the turbulent motions counteract this tendency to clump, they can also sometimes push material into regions of high density, provoking more star formation.
In the image, tiny point-like specks can be seen embedded within the gaseous filaments. These are these high-density areas that will eventually become new stars.

Quan la ciència descriu la meravella no pot més que generar poesia....:)