Lesson 5: Comparing Planetary Systems

-How do observational methods like the transit and radial velocity techniques allow scientists to detect and study exoplanets?

-What patterns in planet size, mass, and orbital distance appear across different planetary systems?

-How do exoplanet systems challenge or support current models of how planetary systems form?

-Why do some planetary systems contain “hot Jupiters” or tightly packed inner planets unlike our own?

-What can comparative analysis of planetary systems tell us about the potential for habitability beyond Earth?

Exoplanet

Hot Jupiter

Super-Earth

Circumstellar disk

Transit method

Radial velocity method

Orbital period

System architecture

Habitable zone

Comparative planetology

Detection bias

HS-ESS1-3 – Use observational data to compare planetary systems and evaluate models of planetary formation and evolution.

NGSS Crosscutting Concepts

-Patterns

-Cause and Effect

-Systems and System Models

-Stability and Change

Students will analyze exoplanet datasets (radius, mass, orbital period, distance from star) to identify patterns and relationships.

Students will interpret graphs and system diagrams to compare planetary system structures.

Students will construct evidence-based explanations connecting detection methods and observational data to models of planetary formation and system diversity.

Students will investigate how planetary systems beyond our own form and evolve by analyzing real exoplanet data collected by missions such as Kepler and TESS. They will compare system structures, planet types, and orbital arrangements to identify patterns and anomalies that challenge or refine existing models of planetary formation.

Students will also explore how detection methods influence what we know about exoplanets and how observational bias affects scientific conclusions.

Activities may include:
-Analyzing real exoplanet datasets to compare system structures
-Plotting orbital period vs. distance for multiple planetary systems
-Comparing systems such as TRAPPIST-1, Kepler-90, and our solar system
-Evaluating how detection methods influence the types of planets we discover
-Constructing models explaining why planetary systems vary in structure

Purpose: Strengthen students’ ability to interpret real scientific data, recognize patterns across systems, and evaluate how evidence shapes and sometimes limits scientific models of planetary formation.

DOK Level: 3 – Strategic Thinking / Reasoning (analyzing multiple datasets, comparing systems, and constructing evidence-based explanations)

Connects to NASA missions like Kepler, TESS, and James Webb Space Telescope, which have transformed our understanding of planetary systems across the galaxy.

Students explore how international collaboration in astronomy is expanding knowledge of potentially habitable worlds and reshaping ideas about Earth’s uniqueness.

This lesson connects directly to current scientific discovery, showing students that exoplanet research is an active, evolving field with new discoveries happening regularly.

Students may assume all planetary systems form like our solar system.

Students may believe detection methods reveal all planets equally, rather than being influenced by size and orbit.

Students may think hot Jupiters are common in all systems rather than a detection-biased discovery trend.

Students may confuse correlation in data with direct cause-and-effect relationships.

Students may assume habitable zones guarantee life rather than just the possibility of liquid water conditions.

-Scaffolded support for interpreting exoplanet datasets and graphs

-Graphic organizers comparing planetary systems side-by-side

-Technology integration using exoplanet simulation tools and interactive databases

-Peer collaboration for analyzing system architecture patterns

-Step-by-step modeling for graphing orbital relationships

-Visual supports for connecting detection methods to data interpretation

-Checkpoints during dataset analysis and system comparison tasks

-Quizzes on exoplanet vocabulary and detection methods

-Graphing assignments comparing planetary system structures

-Constructed-response explanations using evidence from exoplanet data

-Student-created comparative models of planetary systems

-Astronomy slides and worksheets on exoplanets and system comparison

-Exoplanet databases (Kepler, TESS, JWST discoveries where appropriate)

-Interactive simulations of planetary system formation

-Graphs and datasets of orbital and planetary characteristics

-Case studies of notable systems such as TRAPPIST-1 and Kepler-90