PPT-our universe

Our universe Astronomy Approximately May 22 nd to June 10 th We will be discussing our universe Our universe History of Astronomy 2014 Uploaded by the University of Sheffeld. Expanding Universe – consistent w/ a Big Bang?. Olber’s Paradox. Large Scale Structure and relation to Dark Matter. Evidence for the Big Bang. The Cosmic Microwave Background. The abundances of the elements. Lecture . 10; . May . 14 2013. Previously… on astro-2. If the universe is homogenous and isotropic and correctly described by General Relativity:. At any given time the universe is a 3D space. It could be open/close/flat. Homogeneous and uniform cosmic expansion . Hubble constant determines scale factor . Hubble diagram was based on a limited distance scale calibrated by Cepheid variable stars in relatively nearby galaxies. w. here does it end?. Chris North. Cardiff University. The speed of light. c = 299,792,458 m/s. . or 670,616,629 miles per hour. . or 2 million . million. furlongs per fortnight. or ~300,000 km/s. The Milky Way Galaxy. When you look into the hazy band of light across the sky, you are actually looking at our galaxy from the inside. While an awesome sight, you can only truly begin to see it if you get away from city lights on a moonless night. . SIZE and Scale. Of The. Universe. What is your Cosmic Address?. Size and Scale of the Universe. # Street. City. State. Country. Continent. Hemisphere. . Planet. Orbit. Star?. …?. …. …. …. …. Chapter 38. Reminders. Complete last Mallard. -based reading quiz before class on . Thursday (. Ch 39).. I will be sending out last weekly reflection and sample final . on Thursday. . Final exam Thursday, . Flat Earth Theory. Flat Earth Theory. Date: Ancient Times. Scientists: Babylonians, Egyptians. Theory Description: The world is a flat disk, not a sphere. Evidence: None. As early as the 4. th. century BC, scientists and philosophers, such as Aristotle, realized that the Earth was a sphere. Atoms to Astronomy. 2. Special theory of Relativity. It is a basic property of Nature that:. Velocity of Light in vacuum is constant.. All inertial frames are identical so if two objects are moving with a constant velocity, it is impossible to do any test which allows to measure the velocities in absolute manner.. From t=0 to the CBR Era. The CBR. Universe hotter & denser in the past. For T high enough - ionized & opaque – blackbody. and. Currently T=2.726 K. z(opaque. . transparent)~1100 K. The universe is the sum of all energy, matter, space and time.. But there. ’. s a difference between the universe we see (the observable universe) . and the universe as it really exists.. This gets complicated….. The universe is a big place, perhaps the biggest. . –Kurt Vonnegut. Cosmology. Cosmology is the study of the nature of the universe, how the universe began and how it will end, if it does. There is religious cosmology, and scientific cosmology. Our Universe. Lesson 3: Life Cycle of a Star. Lesson Objectives. Let’s Talk Vocabulary. Doppler Effect. Electromagnetic Waves. Red Shift. Blue Shift. Parallax. Let’s Talk Vocabulary. Doppler Effect – the change in a sound’s pitch based on the observer’s position. The universe is a big place, perhaps the biggest. . –Kurt Vonnegut. Cosmology. Cosmology is the study of the nature of the universe, how the universe began and how it will end, if it does. There is religious cosmology, and scientific cosmology.