Discovering Gravity #1

2. he believed that a heavy ball and a light ball fall at the same rate
4. an American astronomer who theorized that the galaxies were full of invisible, unseeable, very heavy dark matter.
6. to send or give out something, such as smoke, gas, heat, or light.
8. doing something, such as a sport or hobby, for pleasure and not as a paid job
10. a branch of mathematics that deals with calculating things such as the slopes of curves
11. an English scientist who invented calculus, and the scientific law of universal gravity
12. to soak up a liquid or take in energy, heat, light, or sound
13. he believed that Earth was not at the center of the universe, but that the sun was at the center.
16. put after a date, BCE stands for Before the Common Era and counts down to zero. CE stands for Common Era and counts up from zero. This book was published in 2023 CE.

1. to be pulled through the air by only the force of gravity
3. he believed that all matter had a natural place and that Earth's natural place was in the very center.
5. the fastest an object will travel in free fall
7. matter particles that do not absorb, reflect, or emit light
9. a person who thinks about and questions the way things are in the world and in the universe
14. to bounce off a surface. To redirect something that hits a surface, such as heat, light, or sound.
15. the path of an object circling another object