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9 How can one get the eccentricity of the orbit of the Sun around center of the Milky Way? jun 5 '13
5 Is interstellar flight possible in near future in a way that would keep our civilization alive? aug 11 '14
2 Why does Venus transit so slowly? feb 15 '13
2 Which one true in First law of thermodynamics: $Q = \Delta U \pm W = \Delta U \pm p\Delta V$ or $\Delta U= \Delta Q + \Delta W $? oct 11 '12
2 How to derive the Manley-Rowe relation for the process of the second harmonics generation? apr 16 '12
1 When to use $f$ and when $\nu$ signifying frequency? apr 16 '12