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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