1. Asteroids

2. Near earth objects (neos): Comets, Meteors, and Asteroids
Characteristics, Composition, & location
S6E1 e. Ask questions to compare and contrast the characteristics, composition, and location of comets, asteroids, and meteoroids.

3. Characteristics - asteroids
Small, irregular shaped object that orbits the sun
Believed to be left-over pieces of planets and moons

4. Asteroids visited by spacecraft. Some can reach to over 250 km across
Asteroids, are “space rocks” that are too small and too numerous to be considered full-fledged planets.
Asteroids visited by spacecraft. Some can reach to over 250 km across

5. Composition - asteroids
Huge chunks of rock and metal (iron and nickel)

6. Location/origin - asteroids
Between mars and Jupiter in the asteroid belt

7. Characteristics - comets
Sometimes called “dirty snowballs”
When close to the sun, ice vaporizes, producing a spectacular streak of gas, referred to as a “tail”
The tail is visible for several nights and stays in the same place relative to the background stars at night
Many travel in a highly elliptical orbit around the sun

8. Bodies in space made up of ice, dust, rock, and frozen gases
Composition - comets
Bodies in space made up of ice, dust, rock, and frozen gases

9. Location/origin - comets
Oort Cloud (just past the outside edge of the solar system) - Long period comets
Kuiper belt – (just past Neptune) – short period comets

10. Meteorite, Meteoroid, Meteor? What’s the difference?

11. Characteristics - Meteroids
Sand grain to boulder-sized
A meteoroid is a chunk of rock or dust in space. Meteoroids usually come from comets or asteroids.

12. Composition – Meteroids
Small, rocky

13. Location/origin- Meteroids
SPACE

14. Characteristics - MeteORS
Meteor is a STREAK OF LIGHT THAT LASTS FOR A FEW SECONDS WHEN A METEROID BURNS UP IN THE EARTH’S ATMOSPHERE
“SHOOTING STAR”

15. So, a Meteor is a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere.

16. Location/origin- MeteORITE
A METEORITE THAT HAS PASSED THROUGH THE EARTH’S ATMOSPHERE and HITS THE EARTH’S SURFACE.

17. Characteristics - MeteORITES
A METEORITE THAT HAS PASSED THROUGH THE ATMOSPHERE AND HITS EARTH’S SURFACE

18. Composition - MeteORITES
3 TYPES:
STONY
IRON
STONY-IRON
(P. 99 IN YOUR WORKTEXT)

19. Review
Q: What is the difference between a meteoroid, meteor, and a meteorite?
Meteoroid = in space, smaller than an asteroid
Meteor = enters Earth’s atmosphere; “Shooting Star”
Meteorite = a small rock or rocky grain that strikes Earth’s surface

20. 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.

21. 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 ______________.

22. 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.