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Out of This World Crossword!

Horizontales
The capacity of doing work.
Air-like state of matter, which can expand to fill any space.
A substance composed of atoms that cannot be broken down by ordinary chemical or physical means.
An expanding shell of glowing gas expelled by a star late in its life.
Term for the longest/shortest days of the year.
Measure of an object's resistance to acceleration when force is applied.
Ratio between mass and volume of a substance.
The combining of the nuclei of lighter elements to form a heavier element.
2 wds. The process by which radioactive isotopes emit or capture tiny particles.
Shrinking moon.
Term for the 2 days/year of which the night and day are equal.
The measure of the average kinetic energy of the atoms or molecules in a substance.
Force of attraction between any two objects with mass.
2 wds. The hot, compact remains of a low-mass star like our Sun that has exhausted its sources of fuel for thermonuclear fusion.
The massive explosion that occurs when a start dies.
Verticales
When the earth or moon cross in front of sun
Growing moon.
Anything that has mass and volume
Positively charged core of an atom.
Another state of matter not obtainable on earth.
2 wds. Large vacuum in space.
A collection of interstellar gas and dust whose gravitational pull is causing it to collapse on itself and form a star.
The amount of energy radiated into space every second by a star. Brightness of a star.
2 wds. Star stage that the sun is currently in.
2 wds. An old, bright star, much larger and cooler than the Sun.
The smallest part of an element that has all of the properties of that element.