Astrophysics Definitions 4.0 / 5 based on 2 ratings ? PhysicsAstrophysicsLenses and opticsA2/A-levelAQA Created by: natfarmer97Created on: 06-05-15 12:00 42956831710 Across 1. Smallest angle where two points can be distinguished (9, 5) 4. Mean distance between the Earth and the Sun (3, 12, 4) 6. The characteristic spectral lines of the elements are all at a longer wavelength than you would expect (8) 7. Every part is the same as every other part (11) 10. Distance between the lens axis and the principal focus (5, 6) Down 2. Stars that are producing helium in their core (4, 8, 5) 3. Change in a wave's wavelength caused by the motion of its source (7, 6) 5. The bright central spot in the system of diffraction rings formed by an optical system with light from a point source (4, 4) 8. Everything looks the same in every direction (9) 9. The universe started off very hot and very dense and has been expanding ever since (3, 3, 3, 4, 6)
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