Lesson 5: Comparing Planetary Systems

How do exoplanets form, and how do their systems compare to our solar system?

What patterns exist in the types, sizes, and orbital arrangements of planets in other systems?

How do observations of exoplanets help refine models of planetary formation?

What similarities and differences exist between terrestrial planets, gas giants, and ice giants across planetary systems?

How can studying other planetary systems help us understand the uniqueness and habitability of Earth?

Exoplanet

Hot Jupiter

Super-Earth

Circumstellar disk

Transit method

Radial velocity method

Orbital resonance

Planetary system architecture

Habitable zone

Comparative planetology

HS-ESS1-3 – Use observational data to compare planetary systems, evaluate models of planetary formation, and explain patterns in planet type, size, and orbital arrangement.

NGSS Crosscutting Concepts

Patterns

Cause and Effect

Systems and System Models

Stability and Change

Students will analyze exoplanet data (mass, radius, orbital period) to identify patterns.

Students will interpret graphs and tables showing planetary system architecture.

Students will construct evidence-based explanations connecting observations to theoretical models of planetary system formation.

Students will explore planetary systems beyond our own, examining how different formation environments produce varied planet types and arrangements. They will study observational methods, such as the transit method and radial velocity, to detect exoplanets and analyze patterns in their orbits and sizes.

Activities may include:

Comparing our solar system with exoplanet systems using real data

Plotting orbital distances and periods of exoplanets

Evaluating how planet type, location, and orbital dynamics vary across systems

Purpose: Reinforce understanding of planetary formation models and the factors that influence system architecture, connecting observations to evidence-based explanations.
DOK Level: 3 – Strategic Thinking / Reasoning (analyzing data, comparing systems, constructing explanations)

Connects to NASA missions and telescopes like Kepler, TESS, and JWST studying exoplanets.

Highlights the diversity of planetary systems and their implications for understanding potential habitability.

Encourages students to see themselves as part of a global scientific effort in space exploration and discovery.

Students may assume all planetary systems resemble our solar system.

Students may think larger planets are always farther from their star.

Students may believe that Earth-like planets are common without analyzing observational data.

Students may confuse the methods used to detect exoplanets and how they provide information about planet size, mass, and orbit.

Scaffolded instruction for interpreting exoplanet data tables and graphs.

Graphic organizers to compare planet type, size, orbit, and system architecture.

Technology integration: simulations showing exoplanet orbits and system dynamics.

Peer collaboration for analyzing observational data and constructing evidence-based comparisons.

Step-by-step guidance for linking observational methods to conclusions about planetary system structure.

Support for visualizing both numerical data and conceptual models.

• Checkpoints during data plotting and system comparison exercises.

• Quizzes on key vocabulary and exoplanet detection methods.

• Evaluation of student-created diagrams comparing our solar system to observed exoplanet systems.

• Constructed-response assignments explaining patterns in planetary system architecture and what they reveal about formation processes.

• Astronomy slides and worksheets on exoplanets and planetary systems

• Exoplanet databases (Kepler, TESS) with mass, radius, and orbital data

• Simulations of planetary system formation and orbital dynamics

• Case studies or articles on notable exoplanetary systems (e.g., TRAPPIST-1, Kepler-90)

• Videos or interactive tools showing transit and radial velocity detection methods