9. Distances in open space Serbian team Regional Center For Talented Youth Belgrade II.

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9. Distances in open space Serbian team Regional Center For Talented Youth Belgrade II

 How do astronomers measure distances between the planets of the Solar System, between the stars in our Galaxy, or between the galaxies?  Determine the distance between the two space objects of your choice.

 Astronomical Unit - AU 150 million kilometers 93 million miles  Light-Year –ly 9,5 trillion kilometers AU  Parsec – pc 3,26 light-years

 Light year

 Radar  Stellar parallax  Standard candles  Redshift and Hubble’s Law

 When we apply trigonometry we have:  if we use a small angle approximation

 If we use parsec as a unit of measurement distance is:

A method of parallax can be used to determine distance to planets in the solar system, only observations are made at the same time from two points on the Earth’s surface

 The “range” for ground telescopes is about 100 parsec (326 light years)  The “range” for space telescopes is up to 500 parsecs (1630 light years)

Cepheid variables are stars whose luminosity varies periodically

 “Range” of this method is 95 million light years. Range ” of this method is 95 million light years.

Occurs in binary systems where a white dwarf is present

 We used the method of parallax  The parallax angle for Proxima Centauri is 0,769’’ => The distance is 1.3 parsec or 4.24 light years

Thank you for your attention! Thank you for your attention!

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