| 1 | January 14,2005: Landing of the Huygens probe on Saturn's moon Titan. | |
| 2 | Christian Huygens, Dutch scientist and astronomer, was born at The Hague, the son of a poet. | |
| 3 | This article analyse the physics signification of Fourier transform by Hugens principle and Fraunhofer diffraction. | |
| 4 | In 2005, the Huygens probe landed on Titan and gave humanity its first view of its unusual surface. | |
| 5 | The discovery by Nasa's Cassini-Huygens mission is the first time a spacecraft has captured direct evidence of an oxygen atmosphere on a world other than Earth. |