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Icy Travelers
Comets are cosmic snowballs of frozen gases, rock and dust roughly the size of a small town. When a comet's orbit brings it close to the sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the sun for millions of kilometers.

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  Explore Comets in 3D Videos Activities

Time Lineup
Topic: Evolving Worlds: Planets, Like People, Grow and Change Over Time
Grade Level: 5-8, 9-12
Body: Our Solar System, Sun, Mercury, Venus, Earth, Mars, Asteroids, Jupiter, Saturn, Uranus, Neptune, Dwarf Planets, Comets, Kuiper Belt & Oort Cloud, Earth's Moon
Mission: ARTEMIS (Earth's Moon), Cassini (Saturn), Dawn (Dwarf Planets), Galileo (Jupiter), Hubble (Beyond Our Solar System), InSight (Mars), Juno (Jupiter), LADEE (Earth's Moon), Lunar Recon Orbiter (Earth's Moon), MSL / Curiosity (Mars), MAVEN (Mars), MESSENGER (Mercury), Viking 01 (Mars), Viking 02 (Mars), Voyager 1 (Our Solar System), Voyager 2 (Our Solar System), WISE (Our Solar System)

Short Description: Students work in groups or as a class to determine the order of events that formed our solar system. This is an excellent activity to begin discussion of events that shaped the solar system and how Earth's geosphere and biosphere have changed -- in an interrelated manner -- through time.


What is a Planet?
Topic: Investigating Our Planetary Family Tree, Our Evolving Understanding of Our Solar System
Grade Level: 9-12
Body: Asteroids, Dwarf Planets, Comets, Kuiper Belt & Oort Cloud, Pluto
Mission: Dawn (Dwarf Planets), New Horizons (Dwarf Planets)

Short Description: Students learn about the characteristics of planets, comets, asteroids, and trans-Neptunian objects through a classification activity. Students can then apply what they have learned by participating in a formal debate about a solar system object discovered by the New Horizons spacecraft and by defining the term "planet."

Time Lineup
Topic: Evolving Worlds: Planets, Like People, Grow and Change Over Time
Grade Level: 5-8, 9-12
Body: Our Solar System, Sun, Mercury, Venus, Earth, Mars, Asteroids, Jupiter, Saturn, Uranus, Neptune, Dwarf Planets, Comets, Kuiper Belt & Oort Cloud, Earth's Moon
Mission: ARTEMIS (Earth's Moon), Cassini (Saturn), Dawn (Dwarf Planets), Galileo (Jupiter), Hubble (Beyond Our Solar System), InSight (Mars), Juno (Jupiter), LADEE (Earth's Moon), Lunar Recon Orbiter (Earth's Moon), MSL / Curiosity (Mars), MAVEN (Mars), MESSENGER (Mercury), Viking 01 (Mars), Viking 02 (Mars), Voyager 1 (Our Solar System), Voyager 2 (Our Solar System), WISE (Our Solar System)

Short Description: Students work in groups or as a class to determine the order of events that formed our solar system. This is an excellent activity to begin discussion of events that shaped the solar system and how Earth's geosphere and biosphere have changed -- in an interrelated manner -- through time.


What is a Planet?
Topic: Investigating Our Planetary Family Tree, Our Evolving Understanding of Our Solar System
Grade Level: 9-12
Body: Asteroids, Dwarf Planets, Comets, Kuiper Belt & Oort Cloud, Pluto
Mission: Dawn (Dwarf Planets), New Horizons (Dwarf Planets)

Short Description: Students learn about the characteristics of planets, comets, asteroids, and trans-Neptunian objects through a classification activity. Students can then apply what they have learned by participating in a formal debate about a solar system object discovered by the New Horizons spacecraft and by defining the term "planet."