Welcome to A105 Stars in addition to Galaxies Todays APOD The Sun Is Pluto a Planet Pluto Basic Data
Hannon, Al, News Director has reference to this Academic Journal, PHwiki organized this Journal Welcome to A105 Stars in addition to Galaxies Instructor: Caty Pilachowski Assoc. Instructor: Tara Angle Todays APOD Read units 1, 2, 3, 4.1 Essential Facts Worksheet due Thursday Earth Radius: 6400 km Distance from Sun: 150,000,000 km 1 AU, 8 light minutes Moon Radius: ¼ Earths radius Distance from Earth: 384,000 km The Sun Radius: 700,000 km Diameter: 1,400,000 km (about 100 x the diameter of Earth) Mass: 300,000 x mass of Earth
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Is Pluto a Planet What is a planet What must be considered to decide if Pluto is a planet Pluto Basic Data Diameter: 0.18 Earth diameters Mass 0.002 Earth masses Inclination 17 degrees (other planets 7 degrees or less) Eccentricity 0.25 (other planets less than 0.2) Guidance from the Discovery of Ceres 1801 Planet suspected between Mars in addition to Jupiter Campaign organized to search the sky Ceres – the first ( in addition to largest) asteroid to be found A planet . or not Image from Hubble
Ceres: Not! Too small Many more asteroids found shortly thereafter Tens of thous in addition to s known today Pallas Juno What defines a planet Round (enough mass as long as strong gravity) Dominant body (tosses smaller bodies out of the Solar System) Orbits the Sun First News Quiz In Class QUIZ – Sept. 5 Astronomy Magazine article on Pluto: www.astronomy.com/asy/default.aspxc=a&id=4474 Use the News Quiz link on Oncourse to find the article
Whos in the class Freshmen Sophomores Juniors Seniors Other School Major Science in addition to the Distribution Requirement Science in addition to technology drive much of modern life Jobs! In as long as med voters make better decisions Why are you taking this class
Why are you taking this class I need to take a science class in addition to astronomy sounded easy/fun I’ve always been interested in astronomy I had space in my schedule as long as another course in addition to thought I’d try astronomy I want to be a science teacher I’m thinking of minoring/majoring in astronomy. My friend is taking the class, so I’m taking it with her/him. This is supposed to be an easy course, in addition to I need to bring up my GPA This course was recommended by a friend I want to amaze my friends in addition to family with my knowledge of the night sky. Where will we start The night sky Learning to see with an astronomical eye Size in addition to scale Where are we going Modern Astrophysics A little physics Tools Underst in addition to ing the Universe The Nearest Stars The closest star to our Sun is Proxima Centauri, about 4 light years distant.
Most of the stars we see in the sky are within 250 light years Our Sector of the Galaxy The Sun lies along one of our Galaxys spiral arms, known as the Orion Arm View of the Milky Way Galaxy Our Milky Way galaxy contains two hundred billion stars. The Sun is about 26,000 light years from the center.
Our Milky Way Galaxy is part of a small cluster of about 3 dozen galaxies. Virgo Supercluster Our Local Group of galaxies is part of a larger Supercluster of galaxy groups. Galaxies in addition to clusters of galaxies collect into vast streams, sheets, in addition to walls of galaxies.
The Visible Universe On the largest scales, the universe seems to be more or less uni as long as m Put these objects in the correct order from the nearest to the farthest from Earth The Sun, the Milky Way, Alpha Centauri, Saturn, the Andromeda Galaxy The Sun, Alpha Centauri, Saturn, the Andromeda Galaxy, the Milky Way The Sun, Saturn, Alpha Centauri, the Milky Way, the Andromeda Galaxy Saturn, the Sun, Alpha Centauri, the Milky Way, the Andromeda Galaxy Overview Organization in addition to course goals
Course Organization Syllabus/Oncourse Text Assigned Reading Lecture Notes Written Assignments Projects Quizzes Observing Office Hours Caty P.: Thursday, 11-noon SW 315 Tara Angle: Tues. 11-noon Weds. 2-3 PM SW 313 GRADES Quizzes (100 pts) Homework Assignments (100 pts) Observing Activities (100 pts) Project (100 pts) Exams (2 x 200 pts) Final Exam (200 pts) Course Goals Science as discovery Use real astronomical data Learn about the process of science Nova GK Per, known as the Firework Nebula exploded in 1901. The star lies 1500 light years away, in the direction of the constellation Perseus.
One question Ive always had about astronomy is ASSIGNMENTS this week Read units 1, 2, 3, 4.1 Essential Facts Worksheet due Thursday 1st News Quiz next Tues.
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