1 / 79

Last Words on SETI & CETI and some Space Travel Basics

This text covers final words about CETI, space travel, space environment, spaceflight projects, and operations. It also discusses extrasolar planets and the Drake equation.

lilliane
Télécharger la présentation

Last Words on SETI & CETI and some Space Travel Basics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Last Words on SETI & CETI and some Space Travel Basics HNRT 228 SPRING 2014 Dr. H. Geller

  2. What I Will Cover Today • Final words about CETI • Space Travel • Space Environment • Spaceflight Projects • Spaceflight Operations

  3. iClicker Question • About how many extrasolar planets have officially been detected to date? • A between 10 and 100 • B between 100 and 1000 • C more than 1000

  4. iClicker Question • How have we detected most extrasolar planets discovered to date (before Kepler mission)? • A Transits • B Hubble Space Telescope images • C the Doppler related technique

  5. iClicker Question • Which technique does the Kepler mission use to search for Earth size planets around other stars? • A Transits. • B The astrometric technique. • C The Doppler related technique. • D Gravitational lensing.

  6. iClicker Question • Nearly all the extrasolar planets discovered to date are • A terrestrial-like planets. • B jovian-like planets. • C large, icy worlds.

  7. iClicker Question • The end result of a calculation with Drake equation is intended to be an estimate of • A the number of worlds in the galaxy on which life has arisen. • B the number of worlds in the galaxy on which intelligence has arisen. • C the number of worlds in the galaxy on which civilizations are transmitting signals now.

  8. iClicker Question • Which of the following statements is true about the terms in the Drake equation? • A Astronomical research will soon give us firm values for all of the terms. • B Some of the terms depend on sociology, and cannot be determined by astronomers alone. • C We already know the terms of the equation to an accuracy within a factor of 2.

  9. iClicker Question • The fact that marine predators like dolphins and sharks have similar shapes despite different ancestry is an example of • A convergent evolution. • B narrow bandwidth. • C spontaneous creation.

  10. iClicker Question • Which of the following would lead an animal to a higher encephalization quotient (EQ) as it evolved? • A Growth in both body size and brain size. • B Growth in body size but not in brain size. • C Growth in brain size but not in body size.

  11. iClicker Question • Two-way conversation with other societies is probably unlikely, even if we make contact. This is mainly because • A aliens won’t speak our language. • B it might be dangerous to get in touch. • C the time it takes for signals to cross the distance to them could be centuries or more.

  12. iClicker Question • One reason the scientists doubt that crop circles have alien origin is • A they are always beautiful. • B they can be easily made by humans. • C their appearance is not correlated with sightings of bright lights.

  13. A Cartoon about CETI

  14. What does a telescope do? • Collect electromagnetic waves • Collecting ability proportional to the square of the diameter of the objective • Resolve electromagnetic sources • Related to the atmosphere, wavelength and curvature of the objective • Magnify surfaces of planets and the Moon • Magnification only of Moon, Sun and planets

  15. Looking Beyond the Eyes

  16. Optical Telescopes Reflector Refractor

  17. Different Views of Sun Sun in Hydrogen-alpha Sun in X-ray

  18. Radio Astronomy Basics

  19. A Little More Detail

  20. Jansky’s Original Radiotelescope

  21. Grote Reber’s Telescope

  22. 170 foot Diameter Radio-telescope at Green Bank, WV

  23. The 100-meter Green Bank Telescope

  24. Even Bigger than you Think

  25. Jupiter in Radio Saturn in Radio

  26. 3C296 Radio/Optical Composite

  27. Smoothing Data

  28. Visualizing the Data

  29. Colorizing the Data

  30. Dealing With Noise

  31. Worldwide Noise Sources

  32. The Space Environment • Solar System • Reference System • Gravity and Mechanics • Trajectories • Planetary Orbits • Electromagnetics

  33. Solar System Considerations • Distance • From Sun • Energy, temperature, condensation of matter • Hostile Environment • Radiation (gamma ray) • Radiation (x-ray) • Radiation (UV)

  34. Coordinate Reference Systems • Geographic • Celestial • Precession

  35. Gravity and Mechanics • Orbits • Kepler • Newton

  36. Orbital Transfers

  37. Planets and Gravity

  38. Flight Project Considerations • Mission Inception • Experiments • Spacecraft Classification • Telecom • Onboard Systems • Science Instruments • Navigation

  39. Mission Inception

  40. Instruments

  41. Telecommunications

  42. Onboard Systems

  43. Operations Considerations • Launch • Cruise • Encounter • Extended Operations • Deep Space Network

  44. Launch Vehicles

  45. Cruise Portion of Mission

  46. Encounter Portion of Mission

  47. Need for Deep Space Network

  48. Interstellar Spaceflight Considerations

  49. THE PHYSICS AND MATH OF SPACE TRAVEL For a spacecraft accelerating at a rate a, the velocity v reached and distance x traveled in a given interval of time t is: c = speed of light Accelerating at 1g = 9.8 m/s2: Crew Duration (yr) Earth Duration (yr) Range (pc) 1 1 0.02 10 24 3 - nearest stars 20 270 42 40 36,000 5,400 - center of Galaxy

  50. iClicker Question • What does the letter “c” stand for in the equations shown? • A Speed of sound • B Speed of light • C A constant of unknown value • D A generic constant • E Speed of time

More Related