Astronomy 104 If you are not registered for the class: The class is full, and the instructor cannot add more students! (lab space is limited) A tiny chance to get in: • if you attend the first two classes • and you are lucky enough to take a seat of someone who drops Note this: • you must take the slot as soon as it opens (through on-line registration) • there is no guarantee you get lucky THERE IS NO WAITING LIST FOR THIS CLASS.
Prepare your scantron: Use a pencil, not a pen! Fill in your name and fill the bubbles under your name. LAST NAME FIRST, First name second Put your 4-digit code instead of “IDENTIFICATION NUMBER”. --- (The last 4 digits of your OleMiss ID.) Question # 1: answer A Question # 2: answer A Question # 3: answer A Setup: Note extra credit deadlines: Signup: Sept. 10 --> contact Shadi 2. Image Proc. Lab turned in: Sept. 17 Reading assignment: Chapter 1, pp. 1 – 24 Labs next Monday or Tuesday – buy the lab book! Please take a moment to mute your cell phone!
The hierarchy of the Universe, Step 1 Step 1: Earth and the Moon Memorize this, please! Size : 12,756 km = 7972 miles Size: 3476 km Earth Moon Distance: 384,400 km
The hierarchy of the Universe, Step 2 Step 2: the Solar System The hierarchy of the Universe, Step 2 Planets The Sun is a STAR The planets revolve around the Sun and reflect sunlight (they are not in a bunch as in this picture) Distance = 150 million km = 1 AU Earth (Astronomical Unit) Memorize this, please! Distance = 400,000 km
The hierarchy of the Universe, Step 3 Step 3: Stars Each star may come with its own planets (we cannot see these planets directly: too small and far away) Star Star Sun Star Distance = a few light years 1 light year = 10,000 billion km (= 1013 km) Star The hierarchy of the Universe, Step 3 Star The closest star (except the Sun): Proxima Centauri - 4 light years
The hierarchy of the Universe, Step 4 ~ 100,000 light years Consists of 100 billion stars and a little rare gas between the stars. Where this gas is a little less rare, it glows and is called a nebula: The Milky Way is a galaxy: the Galaxy Sun The hierarchy of the Universe, Step 4 Step 4: the Milky Way
The hierarchy of the Universe, Step 5 Step 5: The whole Universe The hierarchy of the Universe, Step 5 Consists of 1000 billion galaxies. Size: 10 billion light years The Milky Way Distance = 400,000 km
Questions coming …
sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 4 Which one of the following is large enough contain a nebula? A a star B a solar system C a galaxy D a planet E none of these Next question coming …
sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 5 Which of the following is wrong? A The Universe consists of galaxies. B Galaxies consist of stars. C Solar systems consist of one star and planets. D Planets get their light from their stars. E All the above is correct. Next question coming …
sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 6 Where is the Sun located in the Universe? A In space, far away from all galaxies. B In the center of the Galaxy. C In a nondescript location in the Galaxy. D In the middle of a spiral arm of the Galaxy. E In the center of the Universe. Next question coming …
sec 8 9 10 12 11 7 6 1 2 3 4 13 30 35 40 45 14 25 16 15 18 17 19 20 5 Question 7 What is a light year? A A time as long as the lifetime of a star. B A long time. Stars live a lot longer than one light year. C A distance comparable to the distance between closeby stars. D A large distance. Closeby stars are usually much closer to each other than one light year. E A large distance, comparable to the size of the whole Universe.