Heelal

epa02525016 (FILE) An undated handout released on 05 July 2010 by the European Space Agency (ESA) from the Planck telescope showing the main disc of the Milky Way Galaxy running across the centre of the picture. Astronomers around the globe were celebrating 11 January 2011 after the first results of the survey were released, with findings focusing on coldes objects in the universe. ESA said Planck has found evidence for an otherwise invisible population of galaxies shrouded in dust billions of years in the past, which formed stars at rates some 10¿1000 times higher than we see in our own Galaxy today.  EPA/ESA, HFI and LFI consortia  / HA  EDITORIAL USE ONLY/NO SALES *** Local Caption *** 00000402237790 epa02415257 An undated handout photo released by NASA on 27 October 2010 shows a mosaic of 330 individual images of the Andromeda Galaxy, also known as M31, taken by the ultraviolet/optical telescope aboard NASA's Swift spacecraft. It is the highest-resolution image of the galaxy ever recorded in the ultraviolet wave length. The Andromeda Galaxy is more than 220,000 light-years across and lies 2.5 million light-years away. On a clear, dark night, the galaxy is faintly visible as a misty patch to the naked eye. The irregular shape of the image results when the more than 300 images were assembled to make the final image.  EPA/NASA - HANDOUT

Hoe is het heelal ontstaan? Dat weet niemand 100% zeker.

Wetenschappers denken dat het heelal ongeveer 13,7 miljard jaar geleden ontstond. Toen vond er een enorme explosie plaats: de oerknal of de big bang. Tijdens de oerknal werden allemaal deeltjes de ruimte ingeschoten. Die deeltjes klitten samen en vormden zo sterren en planeten.

Wat was er voor de big bang? Dat weet niemand. Sommigen denken dat er voor de oerknal niets bestond. Anderen denken dat het heelal er altijd is geweest. Nog anderen denken dat God het heelal heeft geschapen. Wellicht zullen we het nooit zeker weten.

Dossier:

Heelal

Laatste wijziging: 21 maart 2016
Dossier Thema: Natuur en Milieu