The SolarSystem is the gravitationally bound system of the Sun and the masses that orbit it, most prominently its eight planets, of which Earth is one. The system formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed... 5 days ago · The meaning of ASTOUNDING is causing astonishment or amazement. How to use astounding in a sentence. very surprising or shocking: 2. very surprising or shocking: . Definition of astounding adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. If something is astounding, you are shocked or amazed that it could exist or happen. The results are quite astounding. Feb 8, 2026 · Adjective astounding (comparative more astounding, superlative most astounding) That astounds or astound. Synonyms: amazing, extraordinary, fantastic, incredible, marvelous, miraculous, … ASTOUNDING definition: capable of overwhelming with amazement; stunningly surprising. See examples of astounding used in a sentence. But for Earth and the other planets that revolve around it, the sun is a powerful centerof attention. It holds the solarsystem together; provides life-giving light, heat, and energy to Earth; and generates space weather.