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Roque de los Muchachos, La Palma 23
De Melkweg
Is een Sterrenstelsel:
    - Grote verzameling sterren, bijeen gehouden d.m.v. zwaartekracht
    - Veel sterren: 100 miljoen tot vele biljoenen
    - Veel lege ruimte

Melkwegstelsel
- ~200-300 miljard sterren
- schijf: ~1000 lichtjaar dik
- Roteert: ~200 miljoen jaar
                                              ~100.000 lichtjaar

                                U bent hier
Stof




       25
Pinwheel galaxy
ANDROMEDA GALAXY
BALK




       28
M87
Sombrero Galaxy
Antennea Galaxy
BALK




       32
Mice Galaxy
Botsende sterrenstelsels
Botsing duurt miljoenen jaren
Botsen sterren ook?         NEE




                                  Mice Galaxy
Op dit moment...
Komt het Andromedastelsel op onze Melkweg af:
 snelheid = 120 km/s
Geen nood: botsing over ~4.5 miljard jaar
Vraag: Hoe groot is
    het heelal?
37
39
Heelal: inhoud
            x 100.000.000.000



           =
200.000.000.000 x 100.000.000.000

            =
     20.000.000.000.000.000.000.000 sterren!
Heelal: omvang



  13,8 miljard
  lichtjaar
Heelal: omvang



 46,5 miljard
 lichtjaar
Heelal: omvang


????????
Vraag: Hoe groot is
  de kans op een
 meteorietinslag?
Stenen
Asteroide


Meteoriet


Meteoor
Meteoren


Rond de 50.000 ton aan ruimtegruis
per jaar
49
Meteorieten


18.000 – 84.000 stenen groter dan
10 gram per jaar
Meteorieten
-Dinosauriers

-Maan

-Verschillende grote inslagen, maar
niet verwoestend

-near-earth objects (groter dan 1
km)
Vraag: Zit de
Aarde in een uniek
   zonnestelsel?
Exoplaneten
http://planetquest.jpl.nasa.gov/

3.625 exoplaneten ontdekt

Waarvan 844 bevestigd

Waarvan 2.781 kandidaat (90% klopt)
54
Exoplaneten: kopie
      Aarde
-Leefbare zone


-Vaste bodem


-Ongeveer 10 exoplaneten voldoen
Exoplaneten: kopie
   Zonnestelsel
-20 triljard sterren


-Schatting: meer planeten dan sterren


-Kans op kopie Zonnestelsel: groot
Exoplaneten
-Directe detectie


-Wiebelende sterren


-Overgangen
     http://www.planethunters.org/

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Teacher Training (Leiden, NL) - Session 2 part 2