Astrophysics Terms 4.5 / 5 based on 4 ratings ? PhysicsAstrophysicsInternational BaccalaureateAll boards Created by: IvanCreated on: 20-02-13 17:17 98345271610 Across 1. A red giant at the end stage of its evolution wil throw off mass and leave behind a small (the size of earth), very dense star in which no nuclear reactions take place. It is very hot but its small size gives it a very low luminositt (5, 5) 5. The sudden increase in luminosity of a white dwarf caused by material from a nearby star falling into the white dwarf (4) 6. A small body (mainly ice and dust) orbiting the sun in an elliptical orbit (5) 7. A collection of a very large number of stars mutually attracting each other through the gravitational force and staying together. The number of stars in a galaxy varies from a few million in dwarf galaxies to hundreds of billions in large galaxies. (6) 10. Powerful energy emitters. these are very active cores of young galaxies. The energy output from a quasar is greater than that of hundreds of galaxies combined. From redshift measurements, quasars are known to move away from us at very high speeds. (7) Down 2. The explosion of a red supergiant star. The amount of energy emitted in a supernova explosion can be staggering - comparable to the total energy radiated by our sun in its entire lifetime! (9) 3. A singularity in space-time: the end result in the evolution of a very massive star (5, 4) 4. a rapidly rotating neutron star emitting electromagnetic radiation in the radio region. Pulsars have very strong magnetic fields. Periods of rotation vary from a few milliseconds to seconds. (6) 8. A group of stars in a recognizable patter that appear to be next to each otherin space (13) 9. Two stars orbiting a common centre (6, 4)
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