p2g threats to earth
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P2gThreats to Earth
P2g Threats to Earth
Using pages 63-65 in your textbooks and on the web:http://www.jpl.nasa.gov/multimedia/neo/index.cfm
P2g Threats to Earth Answer these questions:
• Asteroids a) What are asteroids?b) Where are they found?
2. Past Collisions a) How do we know objects have hit Earth in the past?
b) When was the last major collision?
c) What evidence is there for this?
3. NEOs a) What are NEOs? b) How do astronomers track
them and why?
Comets
What are comets?
What are Comets?
• Comets are lumps of ______ and ______ orbiting the _____
• They were formed at the same time as our _______ ______
The Orbit of a Comet
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