Comenius Dive in the Sky Austria

1. The Doppler Effect
detected by
Christian Doppler

2. How does it work ?
• The lenght of the waves gets longer on the
side where the object go away and shorter on
the other side.

3. How this effect affects our universe
• When a shining objekt
in the universe moves it
behaves like sound

4. • If the speed of the object increase the
wavelength increase too.
v v v

5. We only need the wavelength to
calculculate the speed, because:

6. But the speed is very high to the speed
of light, so we need the formula of the
Theory of the Relativity

7. How we can calculate the distance of
the object when we know the speed ?

8. Hubble law
• The linear correlation between distance (r)
and flightspeed (v) is called hubble law v=h0r

9. Hubble konstant
• „Hubble - konstant" H0 = 72 km/ s·Mpc
1 parsec = 3,6 Lightyears
1Mpc = 3,6 Millionen Lightyears

10. • In 1 Mpc 72km/s
• In 2 Mpc 144km/s
• .
• .
• .
• In ? y Mpc x km/s
x : 72 = y Mpc

11. • 1 Mpc = 3,6 Million Light-years
• y Mpc = 3,6 . y Million Light-years
• Can we imagine this distance?
• In 1s = 300 000 km
• 1Mpc = 3,6 Million Lightyears

12. Spectroscopy
The secret behind the light

13. History:
• 1814 sun spectrum from Joseph von Fraunhofer with
unknown black lines in the spectrum
• 1859 Kirchhoff and Bunsen noticed that different
chemical elements color the flame from a bunsen
burner in different colours.

16. Two types of visual spectroscopy
• Photon emission
• Photon absorption/Fraunhofer lines.

18. Ca+ Hβ Mg Na+He
Hα O2

20. Quasar calculations