It is well-known that there is no spherical/topologically spherical gravitational waves in vacuum space in general relativity. We show that a deviation from general relativity leads to exact vacuum spherical gravitational waves. no matter how tiny this deviation is. We also discuss the related topics. https://safeersappliancers.shop/product-category/siemens-hb656gbs6b-iq700-touch-control-multifunction-electric-built-oven/