Space Systems Synthesis Worksheet

Name:

Date:

Part 1: Retrieve and classify

Learning intention: We are learning to explain how the parts of space systems are classified, organised and affected by gravity.

Success criteria: I can classify an object using evidence; link mass and gravity to shape and movement; place space systems in order; and explain how Kepler supported a Sun-centred model.

Key vocabulary: luminous, reflect, orbit, mass, gravity, spherical, debris, ellipse, heliocentric.

1. Choose the best answer for each statement.

a) A luminous object:

reflects light only

makes its own light

cannot have gravity

b) A planet’s gravity helps it:

clear much of its orbital path

stop orbiting its star

produce its own light

c) The Solar System is part of a:

moon

galaxy

Universe only

2. Match each object to the most suitable description. Draw lines between the columns.

A. Star

B. Planet

C. Moon

D. Comet

E. Asteroid

1. A rocky or metallic object orbiting a star

2. A natural object orbiting a planet or dwarf planet

3. A large object that makes its own light and heat

4. An icy object that can form a tail near a star

5. A large round object that orbits a star and has cleared its path

3. An unfamiliar object is round, orbits the Sun, reflects sunlight and has not cleared its orbital path. What is it most likely to be? Use two pieces of evidence.

Part 2: Model, evidence and relationships

4. Model challenge: Use balls, classroom objects or your imagination to model the Sun–Earth–Moon system. Draw and label the three bodies. Add arrows to show what each body orbits.

Remember: this model shows relationships, not accurate sizes or distances.

5. Misconception check: A student says, “The Moon makes its own light, and an elliptical orbit means Earth will eventually crash into the Sun.” Correct both ideas.

6. Complete the cause-and-effect chain using these words: stronger gravity, mass, spherical, orbit, debris.

More __________ means __________ gravity. Gravity can pull a large body into a __________ shape, bend the movement of an object into an __________, and help a planet clear nearby __________.

7. Claim–Evidence–Reasoning: Explain why Kepler’s observations supported a heliocentric, or Sun-centred, model.

Claim: Kepler’s observations supported the heliocentric model because …

Evidence and reasoning: What did observations of planetary paths show, and why did this fit a Sun-centred model better?

8. Put these in order from smallest system to largest system: Universe, galaxy, planetary system, Moon. Then write one example of a galaxy.

Smallest → largest: ______________ → ______________ → ______________ → ______________

Example of a galaxy: ______________________________

Part 3: Exit synthesis

9. Classify one object from today’s lesson. State its classification and justify your answer with two criteria.

10. In two or three sentences, explain two effects of gravity in the Solar System.

Teacher answer key

1. a) makes its own light; b) clear much of its orbital path; c) galaxy.

2. A–3, B–5, C–2, D–4, E–1.

3. Dwarf planet. It is round and orbits the Sun but has not cleared its orbital path. It reflects sunlight rather than producing its own light.

4. The Moon orbits Earth; Earth orbits the Sun. Arrows should show these relationships.

5. The Moon does not make its own light; it reflects sunlight. An elliptical orbit is a stable curved orbit, so Earth does not automatically crash into the Sun.

6. mass; stronger gravity; spherical; orbit; debris.

7. Kepler found that planets travel in elliptical paths, with the Sun at one focus. These observations matched a Sun-centred model more accurately than an Earth-centred model.

8. Moon → planetary system → galaxy → Universe. Example: the Milky Way.

9–10. Accept scientifically accurate answers that use evidence and correctly link mass, gravity, shape, orbits and clearing debris.