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Out of This World Crossword!

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