Across
- 3. The relationships between the components in a system. See components and system.
- 5. A group of interacting objects or processes. Every system includes components, interactions, and boundaries. See boundaries, components, and interactions.
- 6. The stuff that makes up all living and nonliving objects.
- 7. Rockets, satellites, probes, space stations, and space shuttles that carry various tools and equipment to gather data about space and space objects.
- 9. An advantage, profit, or gain.
- 12. Any representation of a system (or its components) used to help one understand and communicate how it works.
- 13. The extent of a system, separating those components and processes that are part of the system from those that are not. See components and system.
- 17. phases The different shapes of the Moon visible from Earth.
- 19. Variation between a measurement and the true value of a quantity.
- 21. The mean, or average, distance between Earth and the Sun (149,597,870,700 m).
- 23. Someone who pursues understanding of the natural world by using evidence to answer questions.
- 24. The substances, materials, and processes that make up a system. See system.
- 26. The angle of Earth’s axis (approximately 23.5 degrees from perpendicular) relative to Earth’s orbital plane around the Sun.
- 27. A sequence of events that repeats.
- 28. Information that supports or refutes a claim.
- 32. Energy that comes from the sun.
- 33. When the Moon passes into Earth’s shadow.
- 34. Any product or process made by engineers and scientists.
- 35. The change of energy from one type to another, such as from chemical to thermal energy.
- 39. The amount of gravitational pull between two objects. See gravity.
- 42. Something that happens in a repeated and predictable way.
- 43. A scientist who studies objects and events beyond Earth’s atmosphere, such as the movement of stars and planets.
Down
- 1. The systematic study of the natural world.
- 2. A unit of mass in the metric system; 1 gram is equal to 1,000 milligrams.
- 4. When the Moon passes between Earth and the Sun such that the Moon’s shadow causes some places on Earth to experience darkness during daytime.
- 8. Any description or measurement gathered by the senses or instruments.
- 10. The movement of energy from one object to another.
- 11. A star and all of the objects that orbit it.
- 14. Information gathered from an experiment or observations.
- 15. A push or a pull.
- 16. A natural phenomenon that causes objects to be attracted to each other based on each object’s mass and the distance between them.
- 18. The International System of Units (from Système Internationale d’Unités) established by international agreement. SI units are widely used in science, industry, and medicine.
- 20. The worldwide measuring system used by scientists. Also known as the International System of Units (SI).
- 22. The ratio of the size of a real object to the size of a model, map, diagram, or other representation of that object. Can also be used to refer to the general size of objects being referred to, for example molecular scale.
- 25. A desirable outcome given up to gain another desirable outcome.
- 29. The imaginary line around which an object spins, or rotates. Earth rotates around an axis that runs straight through Earth from the North Pole to the South Pole.
- 30. The ability to cause objects to change, move, or work.
- 31. A flat two-dimensional plane where a space object is at any point in its orbit.
- 36. A collection of stars and their solar systems that are gravitationally bound to one another.
- 37. A curved path that a space object takes around a star, planet, or moon.
- 38. A unit of force in the metric system, equal to 1 kg•m/s2.
- 40. The mixture of gases (“air”) that surrounds a planet.
- 41. A unit of length in the metric system; 1 meter is equal to 100 centimeters or 1,000 millimeters.
- 44. The amount of matter in an object.