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How do astronomers measure cosmological distances?

How do astronomers measure cosmological distances?. Parallax . Which object is Further away? Which object is larger? What proof can be provided to support your conclusion?. Parallax. Angle of a fixed object while viewed upon at two different places.

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How do astronomers measure cosmological distances?

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  1. How do astronomers measure cosmological distances? • Parallax

  2. Which object is Further away? • Which object is larger? • What proof can be provided to support your conclusion?

  3. Parallax • Angle of a fixed object while viewed upon at two different places The smaller the angle of parallax, the further away the object

  4. From this side, the observed star appears to be to the right of all the other stars From this side, the observed star appears to be to the left of all the other stars

  5. The further the Star, the Smaller the Parallax angle After travelling far enough away from earth, the parallax angle becomes so small, that the method is ineffective for measuring the distance of celestial bodies.

  6. Parallax distance formula • Distance (parsecs) = 1 • parallax (angle in arcseconds)

  7. Example problem • 2. A star is measured to have a parallax of • p=0.02arcsec: What is it’s distance in parsecs?

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