https://www.abc.net.au/news/2019-10...mospheric-gravity-waves-off-wa-north/11633004 Satellite images have captured a usually invisible phenomenon known as atmospheric gravity waves pulsing through clouds off Western Australia's north-west. Wow what a wonder is Mother Nature.
Only energy forms in the Electromagnetic Spectrum travel at the velocity of light. This includes Visible Light, Ultra Violet, Infra Red, X Rays, and Cosmic Rays, as well as radio waves of all wavelengths (frequencies). Gravity has no velocity....it is instantly formed around a mass. H.P.