GBT in the Hills National Radio Astronomy Observatory Green Bank, WV.

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Presentation transcript:

GBT in the Hills National Radio Astronomy Observatory Green Bank, WV

Measuring the Size and Age of the Universe Introduction

You are an astronomer who has just made this image of the sky. As you study this image, what questions do you ask?

Introduction What are these “fuzzy” objects? Are they moving? Are they part of a system? How far away are they? What are they made of? How were they formed?

galaxy data 1

Gas Spectra Neon Sodium Hydrogen

Radio Spectral Line Hydrogen NGC 628 Radio Spectra

Galaxy data 2

Doppler Shifts Doppler Shift

The Expanding Universe Expansion

If we assume: All spiral galaxies are similar in size to the Milky Way. Spiral galaxies are 10 kpc in radius. Then we can estimate the distance to these galaxies. Assumption s

TAN angle = Opposite Adjacent R Angular size Distance Galaxy distance Distance = Radius TAN angle = Radius Distance

Our dv graph

Hubble Constant 1/T = H 1/H = Time!!! Age of Univers e Slope = V/D T = 1 x D D

Hubble’s Data Hubble’s DV Graph

Calculating H and T

So, What is the Age of the Universe? About 11 BY answer

August, 1999 October, 1999 Sky&Tele 2

Distance Ladder