Crossword Science

2. That which occupies space and possesses rest mass, especially as distinct from energy
4. A tide just after a new or full moon, when there is the greatest difference between high and low water
5. Mass of a unit volume of a material substance
7. Small, rocky objects that orbit the Sun
11. A body's relative mass or the quantity of matter contained by it, giving rise to a downward force
13. The distance light travels in one year
15. A dimensionless quantity representing the amount of matter in a particle or object
16. A tide just after the first or third quarters of the moon when there is least difference between high and low water
17. The circular motion of an object around its center
18. The luminous envelope of a star from which its light and heat radiate
19. The only star in our solar system
20. Happens when, at just the right moment, the Moon passes between the Sun and Earth
24. The degree of hotness or coldness of an object
25. The temperature at which a liquid boils and turns to vapor

1. All of space, and all the matter and energy that space contains
3. The average distance between Earth and the Sun
6. The force exerted by magnets when they attract or repel each other
8. The rate at which heat is transferred by conduction through a unit cross-section area of a material
9. The space occupied within the boundaries of an object in three-dimensional space
10. The Earth is considered to be the center of the solar system
12. A state of matter that retains its shape and density when not confined
14. The Sun is considered to be the center of the solar system
21. A substance that flows freely but is of constant volume
22. Force by which a planet or other body draws objects toward its center
23. The temperature at which the substance changes from a solid to a liquid
26. A substance that has no fixed size or shape