-Integrated Science- Asteroids

Module Overview

  • Title: Minor Members of the Solar System

  • Lessons Included:

    • Lesson 1: Asteroids, Meteors, and Comets

    • Lesson 2: Space Technology

  • Learning Objectives:

    1. Explain occurrences of comets, meteor showers, and other phenomena.

    2. Identify technologies used in studying heavenly bodies and their applications on Earth.

Pretest Summary

  • Assess knowledge on comets, meteor showers, meteoroids, and asteroids.

  • Topics covered include:

    • Primary constituents of comets

    • Meteor shower occurrences

    • Definitions and characteristics of meteorites, meteors, and asteroids.

Lesson 1: Asteroids, Meteors, and Comets

Asteroids

  • Definition: Rocky or metallic objects orbiting the sun, often called minor planets.

  • Characteristics:

    • Reflect little light

    • No atmosphere

    • Sizes vary from pebbles to mountains

    • Major concentration in the Asteroid Belt (between Mars and Jupiter).

  • Examples: Ceres (largest asteroid)

  • Gravitational Interactions:

    • Jupiter prevents asteroids from colliding with inner planets.

Meteors and Meteorites

  • Meteoroid: A piece of stony or metallic object that travels in space.

  • Meteor: When a meteoroid enters the atmosphere, it burns up, creating a visible streak (falling star).

  • Meteorite: Remaining portion of a meteoroid that strikes Earth's surface.

  • Meteorite Statistics:

    • Various sizes result in different frequencies striking the Earth.

  • Notable Incident: An individual hit by a meteorite in 1954 (Ann Hodges).

Comets

  • Definition: Icy bodies composed of rock dust and ice, appearing as bright objects when close to the sun.

  • Characteristics:

    • Comas (gas envelope around the nucleus) and tails (pointing away from the sun).

  • Parts of a Comet: Nucleus, coma, and tail.

  • Notable Comets:

    • Halley's Comet (short-period comet, returns every 76 years).

  • Origin: Most comets originate from the Oort Cloud.

Meteor Showers

  • Definition: Events when multiple meteors are visible,

  • Causes: Occur when Earth passes through a comet’s orbital remnants.

  • Examples: Leonids meteor shower in November 1999.

Lesson 2: Space Technology

  • Purpose: To study asteroids and comets up close using advanced technology.

  • Key Technologies:

    • Hubble Space Telescope: Provides valuable astronomical data.

    • IRAS: First satellite to discover a comet.

    • NEAR: First mission to orbit an asteroid.

    • Viking 1 and 2: First spacecraft to land on Mars.

    • Mariner 10: First to visit Mercury.

  • Spacecraft Function: Collect scientific data in hostile space environments.

Summary of Key Points

  1. Asteroids: Minor planets that orbit the sun, found mostly in the asteroid belt.

  2. Comets: Dirty snowballs that produce spectacular tails as they near the sun.

  3. Meteoroids and Meteorites: Objects in space, with meteoroids burning up in the atmosphere to create meteors, and meteorites being the portions that reach Earth.

  4. Space Exploration: Achieved through various sophisticated spacecraft and technology, enhancing our understanding of the cosmos.