Tag Archives: COSMOS

What is Astronomy? (x)

(BEING CONTINUED FROM  28/06/18) The Lives of Stars How do you figure out the life history of stars? How can we determine the typical history of a person? We could watch a person live out their whole life. But that … Continue reading

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What is Astronomy? (ix)

(BEING CONTINUED FROM  11/06/17) Solar Neutrinos Stars and their Properties Distance Use trigonometric parallax (triangulation) for nearby stars. Parallax = angle subtended (i.e., covered) by 1 A.U., the distance from Earth to the Sun. (1/2 of the diameter of Earth’s … Continue reading

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What is Astronomy? (viii)

(BEING CONTINUED FROM  15/05/16) Forces The Standard Model predicts that there are Four fundamental forces of Nature. Each of the forces is moderated by a Boson. Gravity is by far the weakest of the forces, but because the 2 nuclear … Continue reading

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What is Astronomy? (vii)

(BEING CONTINUED FROM  15/07/15) The Sun: The Nearest Star Photosphere: The Sun’s visible “surface”. It’s the lowest level of the Sun’s atmosphere. Its diameter is about 1.4 x 106 km (0.5° in the sky). In the core the temperature is … Continue reading

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What is Astronomy? (vi)

(BEING CONTINUED FROM 18/01/14) IV: The Solar System Lecture 8 Telescopes Analysis of light is by far the major way in which astronomers gather information about the Universe. So, we need to collect as much as possible and study it … Continue reading

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What is Astronomy? (v)

(BEING CONTINUED FROM  18/01/14) Lecture 7: Light, and Atoms What is Light? Radiant energy Moves through a vacuum a constant speed, c. Exhibits Wave Nature Diffraction Exhibits Particle Nature Reflection Visible light is the light that human eyes are sensitive … Continue reading

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What is Astronomy? (iv)

(BEING CONTINUED FROM  21/05/13) Newton’s Laws of Motion In 1687 Netwon finally published his Principia were he laid out his laws fundamental laws of motion. The Law of Inertia: If the sum of the forces on an object add to … Continue reading

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What is Astronomy? (iii)

(BEING CONTINUED FROM  28/10/12) II: History of Astronomy Early Timeline Ancient Astronomy ~17,000 BC, Lascaux cave paintings depicting celestial events Egypt The Pyramids built with celestial alignments accurate to within a few minutes of arc. Used Diurnal Motions as a … Continue reading

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What is Astronomy? (ii)

(BEING CONTINUED FROM 3/3/12) The Zodiac As Earth orbits, the Sun blocks the view of half the Celestial Sphere, and over the course of the year the Sun’s position in the Celestial Sphere goes through one complete circle (around the … Continue reading

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