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DISTANCES ACROSS THE UNIVERSE Dr. Brad E. Tucker Mt. Stromlo Observatory, ANU University of California, Berkeley
Brad E. Tucker ��
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Why Do We Need Distances?
Planets – Atmosphere, Life R0g�:fE� Stars – Temperature, Size, Age +0g=)f�#f(c Galaxies – Mass, Dark Matter, Age 0KgU_f1BUf(c The Universe – Matter & Energy, Size, Age, Birth and Death !"gBU�P_f�#f(cfV>�NO
Space is Big!
24cm The Sun
Earth
Pluto
Oort Cloud (Comets)
Alpha Centauri (Nearest Star)
2.58 meters
1.30 km
130 – 365 km
7160 km
3YF+0
*0
�C0
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Choose Your Distance Measurement!
Brad E. Tucker RSAA Colloquium 31 October 2013
Credit: Richard de Grijs
Pop 1 stars Active star formation High mass stars
Pop 2 stars Low mass stars
Geometric Methods
Non - Stellar Methods
Pop 1 stars Pop 2 stars
Dist
ance
from
Earth
Y
Z
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