1. Meteoroids! Asteroids! Comets!
Oh, my!

2. Meteor, Meteorite, Meteoroid
Meteoroid = meteorite in space
Meteorite = small rock that strikes Earth
Meteor “Shooting Star” = meteorite enters Earth’s atmosphere, burns up due to friction, produces light

3. Flagstaff, Arizona 49,000 years ago
Meteorite about 150 feet in diameter
Weighed 650 pounds
Energy = 2.5 million tons of dynamite
4000 feet wide, 650 feet deep
Still visible today
Barringer Meteorite Crater

4. “Meteor Shower”

5. Comets/”Dirty Snowballs”
Objects made of ice and dust
-“Tail” due to ice changes states due to Sun’s heat
-Form in Oort Cloud or Kuiper Belt

6. Comets

7. Famous Comets
Comet Hale-Bopp
Halley’s Comet
Comet Kohoutek

8. Asteroids Irregularly shaped rocky object
Remains of when planets formed
From 10 ft. to the size of a mountain
Most between Mars and Jupiter (Asteroid Belt)

9. Large Asteroid hits Earth 65 Million Years Ago
Asteroid 6 to 12 miles in diameter
Produced an explosion = 100 trillion tons of dynamite
Created a crater about 60 miles in diameter
Near the Yucatan Peninsula

10. Torino Scale
A system used to rate the hazard level of an object moving toward Earth

11. Review
Q: What is the difference between a meteoroid, meteororite, and a meteor?
Meteoroid = while in space a meteorite is called a meteoroid
Meteorite = a small rock or rocky grain that strikes Earth’s surface
Meteor = “Shooting Star”

12. Review Q: What is the difference between an asteroid and a meteoroid?
The main difference is the size of the object.
Q: Which is larger, asteroid or meteoroid?
Asteroids are larger than meteoroids.

13. Review
Q: Why is it important to study smaller bodies in our Solar System such as comets or asteroids?
They help us learn about the history of our Solar System.

14. Review
Q: Why do planets and moons with atmospheres have less impact craters than those without atmospheres?
The atmosphere slows and burns smaller objects like meteorites, thus many do not reach the surface to create an impact.

15. Review
Bright streaks of light that result when rocky bodies burn up in the atmosphere are called ___________.
Frozen bodies made of ice, rock, and dust, sometimes called “dirty snowballs” are called _____________.
Small, rocky bodies that revolve around the sun are called ______________.

16. Review
Bright streaks of light that result when rocky bodies burn up in the atmosphere are called meteors.
Frozen bodies made of ice, rock, and dust, sometimes called “dirty snowballs” are called comets.
Small, rocky bodies that revolve around the sun are called asteroids.

17. Review
Q: Discus what could happen if the Earth experienced another large asteroid impact. How would it affect life on Earth?
Forests flattened for many miles
If asteroid landed in water, it would cause giant waves and landslides
Powerful Earthquakes

18. Review Q: Where is the Asteroid Belt?
Asteroid Belt is between Mars and Jupiter
Q: What is the Torino Scale?
A system used to rate the hazard level of an object moving toward Earth