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1 of 5© Boardworks Ltd 2010
2 of 5© Boardworks Ltd 2010 Links to the current IB specifications Topic 11: Wave phenomena 11.2.1 Describe what is meant by the Doppler effect E2 Stellar radiation and stellar types E.2.7 Explain how atomic spectra may be used to deduce chemical and physical data for stars. E4 CosmologyE.4.3 Suggest that the red-shift of light from galaxies indicates that the universe is expanding. E6 Galaxies and the expanding universe E.6.2 Explain the red-shift of light from distant galaxies
3 of 5© Boardworks Ltd 2010 A new planetary system At least five planets (exoplanets) have been found orbiting star HD 10180, 127 light years away. Astronomers have discovered a new planetary system that is the largest ever found and very similar to our Solar System. It is very difficult to observe exoplanets directly. They are small, don’t produce their own light, and are often hidden by their host star’s light. Astronomers therefore use indirect methods to detect them. One common method is radial velocity tracking.
4 of 5© Boardworks Ltd 2010 Exoplanet hunting
5 of 5© Boardworks Ltd 2010 Red shift and the Doppler effect
David - Doppler He is known for the principle he proposed he first proposed in concerning the colored light of double stars in He hypothesized that.
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