| 21. | Gravity waves can propagate in the absence of matter, so they're not analogous to sound.
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| 22. | This was the first proof, indirect though it was, of the existence of gravity waves.
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| 23. | :There are gravity waves, at least in theory.
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| 24. | Barish thinks that gravity waves might help map this so-called dark matter for the first time.
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| 25. | The long, vertical dark lines show where the troughs of gravity waves have roughened the surface.
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| 26. | Equatorial gravity waves can be either westward-or eastward-propagating.
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| 27. | "We don't yet know, but these atmospheric gravity waves may affect the process of ozone destruction,"
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| 28. | According to relativity theory, that stirring action should send out a weak signal of gravity waves.
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| 29. | Gravity waves aligned normally to the direction of the wind can show wide, near-parallel cloud strips.
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| 30. | In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations.
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