It’s difficult to find a perfect synonym, because “blown away” can be used for either a positive or negative reaction. “Overwhelmed” can be used for either, but it has a tendency to be taken negatively. “Overcome” or “amazed” are neutral also in terms of positive/negative, but to me they seem somewhat weaker than “blown away”. “Bowled over” is a pretty good match, but it may seem a bit outdated. “Awe-struck” may come closest, particularly if we take “blown away” as a positive term. When the The fight we’ve all been waiting for The Goat vs The Kid live from Tampa Bay shirt in other words I will buy this Earth’s core cools down, and this spinning slows down, then stops, our magnetosphere would falter and we would lose most of our atmosphere, as it is believed happened to Mars some 3.5 billion years ago… but, “fortunately”, that would take billions more years, and the Sun will have expanded into a red supergiant, having boiled away Earth’s oceans and baked all life on our planet long, long before that will happen.