Solve these clues to fill the grid.
- A proposal intended to explain certain facts or observations
- 5 Across
- English mathematician and physicist
- 7 Across
- Italian astronomer and mathematician who was the first to use a telescope to study the stars
- 8 Across
- The act or process of assigning numbers to phenomena according to a rule (plural)
- 12 Across
- Of or relating to the practice of ___
- 15 Across
- A well-substantiated explanation of some aspect of the natural world
- 16 Across
- Alternative names for the body of a human being
- 1 Down
- Polish astronomer who produced a workable model of the solar system with the sun in the center
- 2 Down
- Back and sides of a hog salted and dried or smoked
- 3 Down
- Measuring instrument for measuring temperature
- 4 Down
- Holy book of Christianity
- 6 Down
- How long something has existed (plural)
- 9 Down
- Dutch pioneer microscopist who was among the first to recognize cells in animals and who gave
- 10 Down
- To increase in size, volume or significance
- 11 Down
- A closed plane curve resulting from the intersection of a circular cone and a plane cutting (plural)
- 13 Down
- The planet we live on
- 14 Down