Forms and Docs. I apologize that I did not update the entire list. Thus, the velocity is proportional to the distance. This means you see no difference in the structure of the universe as you look in different directions. Astrophysics Ib Notes Topics: Sun , Star , Apparent magnitude Pages: 24 (5551 words) Published: February 20, 2013 Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects, as well as their interactions and behavior. Please note that the Scheme of Assessment has changed since 2005. By convention, calculations are normalized to one AU, the radius of the Earth’s orbit, so one half of the measured shift in apparent position is deemed the “parallax” of the target. This is why CMB is so cold now. By continuing to use this website, you agree to their use. Because white dwarf stars are so dense, their gravity is particularly intense. These notes are well presented and are useful if you prefer to study and revise using this format. This separation of light and matter is known as decoupling. KS1, KS2, KS3, GCSE, IGCSE, IB, A Level & Degree Level physics and maths tuition throughout London by specialists Galaxies: stars, gas, and dust held together by gravitational forces. Space curves away from itself and time has no end. Contents: 2. As the universe expanded and cooled, electrons began to bind to nuclei, forming atoms. Contents: 2. The CMB is a perfect example of redshift. If W < 1, the universe is open; if W > 1, the universe is closed. There are 7 basic spectral classes: O, B, A, F, G, K and M. As temperature increases, electrons are kicked up to higher levels by collisions with other atoms. The evidence for an accelerating expansion comes from observations of the brightness of distant supernovae. This equilibrium is gained through nuclear fusion which provides the energy the star needs to keep it hot so that the star’s radiation pressure is high enough to oppose gravitational contraction. We offer specialist tuition in your own home using only graduates with maths and physics Degrees. Year 11 student studying science and psychology. The concept of isotropy is supported by the fact that galaxies do not bunch up in any direction in the sky and by the fact that we observe the same Hubble relation in different directions in the sky. Astrophysics Ib Notes Topics: Sun , Star , Apparent magnitude Pages: 24 (5551 words) Published: February 20, 2013 To understand the Big Crunch and the Big Rip as possible hypotheses of the end of the universe, see the link below. H-R diagrams can also be used to plot the evolution of a star from its birth as a protostar until its death as a white dwarf. If the collision is strong enough (high temperatures) then the electron is knocked off the atom and we say that the atom is ionized. However, if a star is too far away from Earth, its parallax will be too small to be measured with accuracy. Along with providing premium notes for IB … 1 Watch the lectures and try the related exercises See all lectures. Each positron is annihilated to create 2 gamma particles which are in turn absorbed and re-emitted as 200,000 photons of light per gamma particle. The Scale of Astrophysics IB PHYSICS | UNIT 13 | ASTROPHYSICS 13.1. Rotation following Kepler’s 3rd law is shown above as planet-like or differential rotation. The rotation curve of the galaxy indicates a great deal of mass but these masses cannot be observed. Une supernova est l'ensemble des phénomènes qui résultent de l'implosion d'une étoile en fin de vie, notamment une gigantesque explosion qui s'accompagne d'une augmentation brève mais fantastiquement grande de sa luminosité.Vue depuis la Terre, une supernova apparaît donc souvent comme une étoile nouvelle [a], alors qu'elle correspond en réalité à la disparition d'une étoile.
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