What are Planets? - Facts & Definition


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question 1 of 3

According to the International Astronomical Union (IAU), how many criteria are there for official planetary status?

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1. What type of disk is important for planet formation?

2. Where do terrestrial planets typically form?

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About This Quiz & Worksheet

Planets are composed of a variety of interstellar materials that form unique planetary attributes. This quiz and worksheet will help you to understand those specific components and characteristics.

Quiz & Worksheet Goals

These tools will test you on:

  • Formation
  • Criteria
  • Planet types
  • Orbit
  • Our solar system

Skills Practiced

The worksheet and quiz will help you evaluate your skills of:

  • Reading comprehension - ensure that you draw the most important information from the related planetary lesson
  • Interpreting information - verify that you can read information regarding planet formation and interpret it correctly
  • Defining key concepts - ensure that you can accurately define main phrases, such as planetesimal and protoplanetary disk
  • Distinguishing differences - compare and contrast topics from the lesson, such as gas and terrestrial planets

Additional Learning

To fully grasp the material, review the lesson on the Characteristics of Planets. This lesson will assist you in achieving the following objectives:

  • Distinguish the categories of planets
  • Differentiate key components
  • Understand planetary requirements
  • Identify and order our solar system