Lesson 2 Space vocabulary

2. Putting positive stress on the bones, which triggers bone building cells to make the bones stronger.
5. The path of an object moving through space.
8. The means by which aircraft and spacecraft are pushed forward.
12. The state of having water removed.
16. An official document that excludes others from making, using, or selling an invention.
18. Cosmic rays emitted by the Sun and other stars beyond the Solar System.
19. A chemical that releases oxygen for a fuel to burn
20. A food calorie is actually a kilocalorie or kcal. A unit of energy, provided by food, that fuels our bodies.
21. A tool for comparing design solutions against one another, using specific criteria that are based on project requirements.
22. The force that directly opposes the weight of an aircraft and holds the aircraft in the air. In a rocket, lift and thrust are in the same direction.

1. Resistance of air against the forward movement of an airplane or rocket.
3. Process of splitting water into hydrogen and oxygen by means of an electric current.
4. Preserved for long-term use by using heat to kill the microorganisms in the food.
6. A force applied to a body to propel it in a desired direction. The force which moves an aircraft or rocket.
7. A circular or elliptical path followed by one body as it revolves around another body.
9. The amount of water vapor in the air.
10. Resulting quantity of something. For example, the quantity of food produced from crop growth.
11. The force of gravity that pulls objects downward. Not to be confused with mass, the amount of matter in an object.
13. Discarded objects, trash, and other man-made debris left in orbit during space flights.
14. To add water to something, usually a food item, which has had its water removed to save space.
15. A measure of health; the maximum amount of oxygen the body can use during exercise.
17. A state of very weak gravity.