Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Halley's Comet


Published on

Published in: Technology

Halley's Comet

  1. 1. Comets & Halley’s Comet By: Jennifer Wotczak
  2. 2. Agenda 1. Comets 2. Comet Makeup 3. Comet Orbit 4. Comets in History 5. Halley’s Comet 6. Conclusion 7. Bibliography Southern Arizona in 1986
  3. 3. Comets Fast Facts• *Dirty Snowballs – Fred Whipple (icy dirtballs) • Small icy solar system body that outgasses: when ORBITINGTHE SUN • Dust, ice, carbon dioxide, ammonia, methane, and more! • Left over from the formation of stars & planets billions of years ago
  4. 4. Physical Characteristic • Solid nucleus (core) mostly ice, dust, frozen water, ammonia, carbon dioxide, carbon monoxide & methane • As comet approaches the sun nuclear surface turns into gas  forming a cloud known as a COMA • Solar radiation pushes particles away formation of DUST TAIL • Charged particles convert some gases into ions ION TAIL
  5. 5. Quick Picture
  6. 6. More about the Makeup • Most comets nuclei measure 16 km (10 miles) • Some comets have tails that can reach 1.6 million km (1 million miles) wide • & tails reaching 160 million km (100 million miles) long • Comets are visible with the naked eye when they pass close to the sun comas & tails reflect sunlight & glow  energy absorbed from sun.
  7. 7. Let’s Talk Orbit
  8. 8. More about Orbit
  9. 9. Orbital Characteristic • Comets are classified based on the duration of their solar orbit • Short-period orbit 200 years or less • Long-period orbits more than 200 years • Single-apparition comets not bound to the sun, orbit out of the solar system • Scientist have found comets in main asteroid belt might be key source of water for inner terrestrial planets • Long-period comets thought to come from Oort cloud
  10. 10. Oort Cloud • Spherical cloud of predominately icy planetesimals • Surrounds the Sun up to 50,000 AU, almost a light- year • Astronomers believe cloud formed closer to sun, and was scattered out by gravitation effects from the giant plants
  11. 11. Halley’s Comet • Arguable the most famous comet in the world • Visible to the naked eye every 76 years roughly (if your lucky it might appear twice in your lifetime) • Last appeared in 1986 first time technology allowed for in depth study • Next appear in mid 2061(if you are 20 know, you’ll be 68)
  12. 12. A Bit of Halley History • Halley’s comet records date back to 240 BC • In clear records of the Chinese, Babylonians, and medieval Europeans • PERIODICITY first determined in 1705: English Astronomer Edmond Halley
  13. 13. 1986 • First time we has the technology to get close to the comet • When it passed earth in 1986: 5 spacecraft's flew past it & gathered unprecedented detail • First time close enough to look past coma and study nucleus • Nucleus was equal parts ice & dust • 80% of ice water • 15% carbon monoxide
  14. 14. Quick Video •
  15. 15. Important Take Always • Comets: Ice & Dust balls left over from star & planetary creation billions of years ago • Most orbit the sun & when they get close, nucleus heats up and forms a gas atmosphere called a coma • The solar radiation pushes dust & gas off form dust & ion tail • Halley’s Comet “Comet of Earth” • Visible to the naked eye every 76 years • Hopefully in 2061 we will ALL see Halley!! 
  16. 16. Thank you!
  17. 17. Bibliography • • exploration.html