Changes between Version 118 and Version 119 of AstroTechTalk

Timestamp:

17 Sep 2015, 11:10:19 (9 years ago)

Author:

Ralph Hofferbert

Comment:

--

AstroTechTalk

@@ -25 +25 @@
 
 ||'''Date''' ||'''Speaker              ''' ||'''Topic''' ||
-|| '''18.09.2015''' || '''Martin Kuerster''' || '''How big is the universe?'''[[BR]]Most astronomers believe the universe is infinite. But do we really know this? We have to get an idea of the biggest we can think of, to answer this question. This can only work if, since the beginning, the universe follows everywhere the same rules. The rules, which we know from our local cosmic neighborhood. That is to say, all laws of nature are valid at any place at any time - what is not self-evident.[[BR]][[BR]]The presentation will explain the known universe by continuously traveling farther away into space and back in time. It will be explained how astronomers measure the distances in the universe to get an idea of its size. And, we will follow the evolution of the universe starting at the most extreme physical state of the universe - the big bang.[[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2015S2/2015-09-18_Wie_gross.pdf Slides: German][[BR]]Questions: German, English[[BR]] ||
+|| '''18.09.2015''' || '''Martin Kuerster''' || '''How big is the universe?[[BR]][[BR]]'''Most astronomers believe that the size of the universe is infinite.      But how certain can we be about this?  When trying to answer this     question we attempt to make a statement about the world as a whole, about the biggest entity that we can     imagine.  This can only succeed, if we can assume that the behaviour     of the universe at large equals the behaviour that we know from our cosmic neighbourhood and that it also was the same at earlier times.  This means that the same laws of nature must     be valid at any time and everywhere, which cannot be taken for granted.[[BR]][[BR]]     A journey to increasingly larger distances and earlier times will     provide an overview of the known universe.  The talk will outline     the way astronomers measure distances in the universe. Starting off from its origin in the extreme physical state that we     call "big bang" the evolution of the universe will be illustrated.[[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2015S2/2015-09-18_Wie_gross.pdf Slides: German][[BR]]Questions: German, English ||
 || 25.09.2015 || Markus Feldt || SPHERE - Lessons learned? ||
-|| '''02.10.2015''' || '''Kai Noeske''' || '''The history of light in the universe[[BR]]'''Nearly all visible light  is created in the outer layer of stars. Therefore, the visible light of  the universe explains the history of a star and when it was born.[[BR]][[BR]]We  will learn how the birth of stars is connected with large structures of  matter and the galaxies. The understanding of the history and the birth  of stars plays a key role in understanding the universe and its  evolution. This knowledge explains the assembly of structure in dark  matter, tells us about physics behind the birth of stars and gas in  galaxies and helps to understand the creation of heavy chemical  elements, which finally lead to the generation of earth like planets and  the live on it.[[BR]][[BR]]As of late, the history of stars can be observed  with large telescopes from ground and space up to more than 12 billion  years into the past and in short even to a 100 million years after the  big bang. These observations are accompanied by enormous computer  simulations to understand the physics in the stars and in the Galaxies  better and better. [[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2015S2/2015-09-18_Geschichte_des_Lichts.pdf Slides: German][[BR]]Questions: German, English ||
+|| '''02.10.2015''' || '''Kai Noeske''' || '''The history of light in the universe[[BR]][[BR]]'''Nearly all visible light  is created in the outer layer of stars. Therefore, the visible light of  the universe explains the history of a star and when it was born.[[BR]][[BR]]We  will learn how the birth of stars is connected with large structures of  matter and the galaxies. The understanding of the history and the birth  of stars plays a key role in understanding the universe and its  evolution. This knowledge explains the assembly of structure in dark  matter, tells us about physics behind the birth of stars and gas in  galaxies and helps to understand the creation of heavy chemical  elements, which finally lead to the generation of earth like planets and  the live on it.[[BR]][[BR]]As of late, the history of stars can be observed  with large telescopes from ground and space up to more than 12 billion  years into the past and in short even to a 100 million years after the  big bang. These observations are accompanied by enormous computer  simulations to understand the physics in the stars and in the Galaxies  better and better. [[BR]][[BR]]Presentation: German                  [[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2015S2/2015-09-18_Geschichte_des_Lichts.pdf Slides: German][[BR]]Questions: German, English ||
 || 09.10.2015 || || ||
 || 16.10.2015 || || ||