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Earth and Space Science Vocab Set #2

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Propagation
To move through, cause to move through, or transmit, expecially in the form of a wave
Lunar
Of, determined by, relating to, or resembling the moon
Seismometer
An instrument for measuring the direction, intensity, and duration of quakes on earth or another body by measuring the actual movement of the ground
Seismic Wave
A planetary vibration/wave generated by an earthquake, moonquake, impact, or explosion
Meteoroid
Any of the small bodies, often remnants of comets, traveling through space
Attenuation
A discrease in a property, as energy, per unit area of a wave or a beam of particles, occuring as the distance from the source increases as a result of absorption, scattering, spreading in three dimensions
Dispersion
The action or process of distributing things or people over a wide area
Receding
Go or move back or further away from a previous position
Corner Cube Reflector
Reflective devices placed on the surface of the moon allow laser beams to be redirected back to earth
Variation
1 a change or difference in condition, amount, or level, typically with certain limits 2 a different or distinct form or version of something
Precession
The slow movement of the axis of a spinning body around another axis due to a torque (such as gravitational influence) acting to change the direction of the first axis