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Crossword clues

Solve these clues to fill the grid.

A collection of star systems
5 Across
How much matter something contains
6 Across
The tendency of a body to maintain its state of rest or uniform motion unless acted upon by
9 Across
Distance travelled per unit time
10 Across
Any collection of particles or gases that is visible (plural)
11 Across
Everything that exists anywhere
12 Across
How hot or cold something is
13 Across
How tightly packed the matter in something is
14 Across
How loud something is, or how much space it fills
15 Across
Force that pulls objects toward the Earth
1 Down
Any celestial body orbiting around a planet or star
2 Down
The path described by one celestial body in its revolution about another
3 Down
The length of a line segment between the center and circumference of a circle or sphere
4 Down
The property of relative size or extent
7 Down
Natural satellite that orbits the Earth
8 Down

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