21. During this time, Lindzen published some research on gravity waves , as well as Hadley circulations. 22. Gravity waves have teased physicists for decades, because they have announced their presence only indirectly.23. In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations. 24. Only signals that arrive simultaneously at Hanford and Livingston will be considered as gravity wave candidates. 25. Booker and Bretherton showed that vertically propagating gravity waves were completely absorbed at a critical level. 26. The gravity wave represents a perturbation around a stationary state, in which there is no velocity. 27. That would require signaling somehow with gravity waves . 28. Gravity waves aligned normally to the direction of the wind can show wide, near-parallel cloud strips.29. According to relativity theory, that stirring action should send out a weak signal of gravity waves . 30. "We don't yet know, but these atmospheric gravity waves may affect the process of ozone destruction,"
