The Solar System

6. The force that attracts objects toward one another.
7. Energy emitted as electromagnetic waves or high-energy particles.
10. A large celestial body that orbits a star and has cleared its path of other debris.
12. A group of stars forming a recognisable pattern or "picture."
14. A "dirty snowball" of ice and dust that develops a tail when near the Sun.
18. An oval-like shape; often describes the path of orbits.
20. The branch of science that studies space and the physical universe.
22. A drawing that represents the relative distances or sizes of celestial bodies accurately.
23. When one celestial body moves into the shadow of another.
25. The distance light travels in one year (about 9.46 trillion km).
26. An object that orbits a planet (can be natural like the Moon or man-made).

1. The lightest and most abundant element; the primary fuel for stars.
2. Small particles of matter floating in space.
3. An imaginary line through the centre of a body around which it rotates.
4. The whole of all space, time, matter, and energy.
5. Reoccurring arrangements, such as the cycle of moon phases or constellations.
8. A small, rocky object that orbits the Sun.
9. A massive system of stars, gas, dust, and dark matter held together by gravity.
11. An unmanned spacecraft sent to explore and send back data from space.
13. The curved path an object takes around a star, planet, or moon.
15. A streak of light caused by a space rock burning up in Earth's atmosphere.
16. A gas found in the atmospheres of planets like Neptune and moons like Titan.
17. A giant cloud of dust and gas in space, often a nursery for new stars.
19. The layer of gases surrounding a planet or star.
21. A luminous ball of gas (mostly hydrogen and helium) held together by gravity.
24. A reusable spacecraft designed to transport people and cargo to and from space.
26. A group of interacting objects, like a star and its orbiting planets.