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Space Fossils
The Kuiper Belt is a disc-shaped region of icy objects beyond the orbit of Neptune -- billions of kilometers from our sun. Pluto and Eris are the best known of these icy worlds. There may be hundreds more of these ice dwarfs out there. The Kuiper Belt and even more distant Oort Cloud are believed to be the home of comets that orbit our sun.

Kuiper Belt & Oort Cloud Icon
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Just the Facts
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  Explore KBOs in 3D 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."