Space and Space Travel ESS 102
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1 Space and Space Travel ESS 102
2 Instructor for today and about 20% of future lectures Dr. Jeremy Thomas JHN 270D, ) Feel free to contact me about any aspects of the course.
3 Space and Space Travel A Reminder: There will be a tutorial on the math required for this class Friday, January 5th at 5:30PM (JHN 102) Tuesday, January 9th at 5:30PM (JHN 102)
4 Space and Space Travel Why do we care about the Space Environment? 1) Space is lethal and our changing atmosphere and space environment are our cocoon. X-Rays and UV radiation are (usually!) stopped in our atmosphere. Cosmic Rays ( particles, mostly protons from Sun and Space) enter our atmosphere. 8% of our radiation exposure comes from Cosmic Rays An 12 hr airplane flight is equivalent to 1/2 a chest X-Ray Cosmic Rays important for atmospheric electric fields and lightning Cosmic Rays may produce mutations and be important for evolution.
5 Space and Space Travel Why do we care about the Space Environment? 2) Planetary Hazards: Space has evolved over billions of years (impacts-supernovae) 3) Technology depends on space: Communications Satellites Weather Prediction (Galveston-1900, Children s Blizzard-1888) Global Location with GPS Global Remote Sensing (deforestation, fires, pollution, ozone) WIFI world (XM, Sirius, DirectTV, etc.)
6 Space and Space Travel Why do we care about Space Travel? 1) We re Explorers! Space and planetary environments are hostile to us and our robot probes. We dodged a bullet with Apollo, Russia didn t at Mars. Weightlessness, radiation, and local conditions (Temperature, Pressure, etc.) are big concerns. Space is BIG. Current methods of travel require long periods to reach targets. Expansion of Human Habitats. Other environments in the solar system. Can we survive there? Is life (or conditions for life) present anywhere else?
7 Space and Space Travel Why do we care about the Space Travel? 2) Space Travel is Expensive: Space Shuttle costs $10000 per pound! Cheap access to space costs $1000 per pound! 3) Space Travel is Inefficient and Slow: >90% of most missions is composed of fuel. Even our fastest spacecraft take years to get anywhere (Voyager 2 took ~12 years to reach Neptune) We must rely on gravity once we launch
8 Space and Space Travel Why do we care about the Space Travel? 4) Power and Communications are Difficult: Solar power doesn t work well in the outer solar system. Neptune is 8 hours (round trip) away by radio Communications requires large, expensive networks of radio telescopes. (the Deep Space Network) 5) New Technologies are Being Developed: Understanding what is needed requires knowing what the problems are..
9 Space and Space Travel Milestones in Space Exploration ( ): 1) 12/17/1903: First Human Flight. 2) 1/13/1920: R. Goddard Rocket Propulsion Treatise. (NY Times Blasts Goddard) 4) 3/26/1926: Launch of First Liquid Fuel Rocket. 5) 10/04/1957: Sputnik 1 Orbits Earth. 6) 4/12/1961: Yuri Gargarin Orbits Earth. 7) 12/14/1962: Mariner 2 Flys by Venus. 8) 7/16/1969: Apollo 11 Lands on Moon. (NY Times Apologizes to Goddard)
10 Santos-Dumont Paris 1906 First-flight??
11 Space and Space Travel Milestones in Space Exploration ( ): 9) 12/15/1970: Vernera 7 Lands on Venus 10) 04/19/1971: Salyut 1 is the First Space Station 11) 11/14/1971: Mariner 9 Orbits Mars 12) 07/20/1976: Viking 1-first long duration lander 13) 04/12/1981: First Flight of Shuttle Columbia. 14) 08/29/1989: Voyager 2 Reaches Neptune. 15) 07/4/1997: Pathfinder Lands on Mars 16) 12/17/2003: Attempt to recreate Kitty Hawk Flight Fails 17) 01/4/2004: Spirit Lands on Mars 18) 01/14/2005: Huygens Lands on Titan (4.5 billion times further than Kitty Hawk)
12 Exploring our Star System Why do it? The Copernican Principle: Any observation that suggests our position in the Universe is somehow unique or special is wrong or incomplete. What we know: We live in a star system that contains a single central Sun with several planets of different types orbiting it. Our Hypothesis: This is NORMAL. Is this true and what does mean???
13 Our Local Inventory: What makes up our star system? 1) A Single central star of type G (yellow-dwarf). 2) Two sub-stellar giant planets. (Jupiter & Saturn) 3) Two icy-gas hybrid planets. (Uranus & Neptune) All of the above planets have large systems of satellites; some planet sized. (Io, Europa, Ganymede, Callisto, Titan, and Triton) 4) Four much smaller rocky planets. (Mercury, Venus, Earth, & Mars) 5) Two areas of failed planetary debris a) one rock based (Asteroid Belt between Mars and Jupiter) b) one ice-based (Kuiper Belt starting at Neptunes orbit). 6) Several Dwarf Planets. (Pluto) 7) An extended distribution of ejected debris. (Oort Cloud well past Pluto)
14 The Sun and the Solar System Any study of the solar system must start with the Sun.. 1) The sun contains 99.9% of all the mass in the solar system (Jupiter has most of the remaining 0.1%) 2) The sun dominates energy (and light) production at all frequencies (except in radio waves where human activity is stronger!) 3) Solar energy largely determines the temperatures of every object in the solar system. 4) Material from the Solar Atmosphere is the dominant component of interplanetary space. Compared to the Sun, the planets are nearly inconsequential..
15 Neptune Uranus Saturn Jupiter Earth The Sun Dominates the Solar System. Sol The places we are most interested in don t add up to very much Earth Venus Mars Ganymede Titan Mercury Callisto Io Moon Europa Triton Pluto
16 Exploring our Star System How and Where? History is Written in what we see: The distribution, composition, and evolution of material in the solar system tells us how we got from a cold cloud of gas & dust to the present: 1) How did the Sun form and evolve? 2) How do planets form and where? 3) What does the distribution of planets and debris tell us about the early solar system? 4) How do planets change with time and what are the processes involved? 5) How does the interaction with the Sun affect conditions on a planet on various time scales? 6) What does our system tell us about others?
17 Scales in the Solar System The Solar System is characterized by extremes: 1) The very hot to the very cold 2) The very big to the very small 3) The very dense to the very tenuous 4) The very close to the very distant 5) The very numerous to the very unique 6) The very fast to the very slow
18 Scientific Notation: Scientific Notation is a shorthand way of writing and multiplying large (and small) numbers Nano (n) (billionth) Micro (µ) (millionth) Milli (m) (thousandth) Unity Kilo (k) (thousands) 1,000, Mega (M) (millions) 1,000,000, Giga (G) (billions) 1,000,000,000, Terra (T) (trillions) To do numbers that are not divisible by ten, we multiply by an exponential number. 4,275,000,000 = x 10 9 or = 3.74 x 10-4
19 Using Scientific Notation: To multiply numbers using scientific notation we add the exponents x 10-9 = 10 (3) + (- 9) = x 10 5 = 10 (2) + (5) =10 7 To divide numbers using scientific notation we subtract the exponents = 10 (3) - (- 9) = = 10 (2) + (5) =10 7 To add or subtract numbers using scientific notation we work in front of the exponents. 3.0 x x 10 5 =2.603 x x x 10 2 =0.993 x10 5
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