Science Grade 8-Space Rock-Meteor,Meteorites, Meteoroids

Educational Purpose

1. Good morning, students! ^_^

2. Review Direction: Tell what should be your response if PAGASA declared the following color-coded warning signal in your area.

3. 1. Yellow Warning

4. 2. Orange Warning

5. 3. Red Warning

6. Congratulations, everyone! You did great. ^_^

7. SPACE ROCKS Chapter 8

8. Learning Objectives At the end of the lesson, the students should be able to: Compare and contrast comets, meteors, and asteroids. Predict the appearance of comets based on recorded data of previous appearances. Explain the regular occurrence of meteor shower.

9. Lesson 8.1 Asteroids: Planetary Building Blocks Asteroid – small celestial bodies that are usually rocky or metallic Majority of known asteroids are found in the asteroid belt .

10. Lesson 8.1 Asteroids: Planetary Building Blocks Asteroids come in various shapes: elongated , spherical , and irregular . Trojans – asteroids that share an orbit with a large planet or the planet’s natural satellite

11. Lesson 8.1 Asteroids: Planetary Building Blocks Near-Earth Asteroids (NEAs) – mostly watched by astronomer because their orbit puts them within collision rate with Earth

12. Lesson 8.1 Asteroids: Planetary Building Blocks Asteroids are given names by the astronomers who precisely calculated their orbits. Ceres was discovered in 1801 by Guiseppe Piazzi.

13. Lesson 8.1 Asteroids: Planetary Building Blocks Planetoids – asteroids that are big enough that a spaceship can land on them, and people can walk on them. Many asteroids are believed to be rich in iron, nickel, and other metals.

14. Lesson 8.2 Comets: Occasional Visitors Comets – considered as occasional visitors from space. Comets are visible to the naked eye.

15. Lesson 8.2 Comets: Occasional Visitors Comets are often described as “dirty snowballs” . Comets contain carbon dioxide, ammonia, methane, and other compounds.

16. Lesson 8.2 Comets: Occasional Visitors Comets are named after the person who discovered them. Halley’s Comet was named after the astronomer Edmond Halley.

17. Lesson 8.2 Comets: Occasional Visitors Comets the were visible in the Philippines include the following: Halley’s Comet Comet Ikeya-Seki Comet Kohoutek Comet West Comet Hyakutake

18. Lesson 8.2 Comets: Occasional Visitors Comets the were visible in the Philippines include the following: Comet Hale-Bopp Comet McNaught and Holmes Comet C/2022 E3 (ZTE)/Green Comet

19. Lesson 8.2 Comets: Occasional Visitors

20. Lesson 8.2 Comets: Occasional Visitors Coma – formed from the released dust and gas that form a huge extremely unstable atmosphere around the comet. Coma comes from the Greek word “ kome ” , which means “long hair” .

21. Lesson 8.3 Meteoroids: Metal Rocks Meteoroids – fragments of rocky material with similar composition as the terrestrial planets. Micrometeoroids or Cosmic Dusts – very tiny meteoroids.

22. Lesson 8.3 Meteoroids: Metal Rocks The glowing tail of meteoroids are called meteor . It is colloquially known as shooting stars , falling stars , or bulalakaw .

23. Lesson 8.3 Meteoroids: Metal Rocks Fireballs – meteors that appear to glow brighter than planets. Bolides – where fireballs explode.

24. Lesson 8.3 Meteoroids: Metal Rocks Meteorite – meteoroid that manages to reach the Earth’s surface.

25. Lesson 8.3 Meteoroids: Metal Rocks One of the largest meteorites ever recovered from the Philippines is the Bondoc meteorite named after the Bondoc Peninsula in Quezon Province.

26. Reference/s Exploring Life Through Science 8 (pp.122 – 128)