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How Do Scientists Classify Planets?

4 minutes, 57 seconds

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Learn the three criteria for classifying planets and discover why Pluto is now considered part of the Kuiper belt. When Pluto was discovered in 1930, it was classified as the ninth planet in the solar system. However, advances in technology brought about new knowledge of Pluto, and it is now recognized as a dwarf planet.

Media Details

Runtime: 4 minutes, 57 seconds

Topic: Science
Subtopic: Astronomy, Science Methods, Space Sciences
Grade/Interest Level: 7 - 12
Standards:

Release Year: 2015
Producer/Distributor: PBS Learning Media
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Spacecraft enters the Martian atmosphere, causing intense heating and friction that is displayed in a glowing, fiery tail of light.

Large rounded blue and white instrument with round opening at the front. Man faces it in foreground. Title card reads, "A flying telescope in a 747?!"

Textured mount-like landform. Caption: It was incredible how Earthlike Titan appeared.

Seedlings burst through the dry surface of an arid landscape. Text reads, “AIRS. Advancing Our Understanding of Earth’s Climate.”

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