Astrophysics - Surveying the Stars 4.5 / 5 based on 6 ratings ? PhysicsAstrophysicsA2/A-levelAQA Created by: LaurenCreated on: 03-05-14 08:30 25687913410 Across 1. A measure of its brightness which depends on the intensity of light received from the star. (8, 9, 1) 4. A star that is much smaller in diameter than the Sun. (5, 4) 5. The distance to a star which subtends an angle of 1 arc second to the line from the centre of the Earth to the centre of the Sun. (6) 7. Light emitting outer layer of a star. (surface of the star) (11) 8. When a relatively near star shifts in position against the background of more distant stars as the Earth moves around its orbit. Occurs because the line of sight to a nearby star changes direction over 6 months. (8) 10. A star exploding which releases so much energy it can outshine its host galaxy. (9) Down 2. The core of a supernove after all the surrounding matter has been thrown off into space. Extremely small in size compared with a star. (7, 4) 3. Pulsating radio stars. High speed rotating neutron stars that produce beams of radio waves. (7) 6. Hydrogen absorption lines (correspond to excitation of hydrogen atoms from the n=2 state to higher energy levels) (6, 5) 9. Assemblies of stars prevented from moving away from each other by their gravitational attraction. (8)
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