Threats to Earth

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3

Contents

• Threats to Earth
• Objectives
• Asteroid Ida with it’s moon Dactyl
• Asteroids
• Collisions?
• Objectives
• Halley’s Comet Reappears every 76 years Image from 1986
• Hale-Bopp as seen from Craig County, VA in 1997
• Hale-Bopp as seen from Alexandria, VA in 1997
• Hale-Bopp as seen from Wyoming in 1997
• Yerkes Observatory

Last added presentations

• Heat-Energy on the Move
• Practical Applications of Solar Energy
• Geophysical Concepts, Applications and Limitations
• Understanding Heat Transfer, Conduction, Convection and Radiation
• Radiation
• Direct heat utilization of geothermal energy
• Magnetic field uses sound waves to ignite sun's ring of fire