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Science Crossword.

Across
The transfer of energy by electromagnetic waves.
An imaginary line that circles Earth halfway between the North and South poles.
The transfer of thermal energy from one particle of matter to another.
The outermost layer of Earth's atmosphere.
The amount of matter in an object.
Lowest layer of Earth's atmosphere.
The central region of the sun, where nuclear fusion takes place.
The path of an object as it revolves around another object in space.
A pattern or grouping of stars that people imagine to represent a figure or object.
The layer of Earth's atmosphere immediately above the stratosphere.
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
The change in state from a gas to a liquid.
Down
An imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates.
The relatively thin layer of gases that form Earth's outermost layer.
A form of oxygen that has three oxygen atoms in each molecule instead of the usual two; toxic to organisms where it forms near Earth's surface.
All of space and everything in it.
The amount of space an object takes up.
A dark area of gas on the sun's surface that is surrounded by cooler gas.
The second-lowest layer of Earth's atmosphere.
Any form of water that falls from clouds and reaches Earth's surface as rain, snow, sleet or hail.
The transfer of thermal energy by the movement of a fluid.
The process by which molecules at the surface of a liquid absorb enough energy to change to a gas.
An optical instrument that forms enlarged images of distant objects.
A unitless measurement of the brightness of an object in a defined passband.
The outer layer of the sun's atmosphere.