1. The spin of an object around its center point or axis
rotation
The spin of an object around its center point or axis

2. The orbit of one object around another object
revolution
The orbit of one object around another object

3. The position of the Sun is exactly over the equator
equinox
The position of the Sun is exactly over the equator

4. solstice
Moment in the year when the Sun’s path is farthest north or south from Earth’s equator

5. The lit part of the moon becomes larger
waxing
The lit part of the moon becomes larger

6. The lit part of the moon becomes smaller
waning
The lit part of the moon becomes smaller

7. tide
The rising and falling of the surface of the ocean caused by the gravitational force of the moon & sun

8. eclipse
The movement of one object in the solar system into the shadow of another object, blocking it from view

9. Celestial body in orbit around the sun
planet
Celestial body in orbit around the sun

10. moon
Natural satellite that revolves around a planet or other celestial object other than a star

11. Chunk of rock and metal that orbits the Earth
asteroid
Chunk of rock and metal that orbits the Earth

12. Chunk of ice and rock that orbits the Sun
comet
Chunk of ice and rock that orbits the Sun
Halley’s comet comes around every 75 years/2061

13. meteoroid
Small, rocky particles that move through space (when they enter Earth’s atmosphere, they produce a streak of light called a meteor

14. star
Large sphere of hydrogen gas hot enough for nuclear reactions to occur in its core

15. The distance light travels in one year
Light year
The distance light travels in one year

16. Huge collection of stars, gas, and dust
galaxy
Huge collection of stars, gas, and dust