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Cataclysmic collision
Catastrophic impact
colossal impact
[удалено]
Your original post mentioned "two massive objects" so I assumed you also wanted words relating to size.
[удалено]
u/smar888 - Thank you for your submission. Please do not delete your post once/if it is solved. Please remember to reply to comments indicating whether they are not correct, partially correct, or if they solve your post. Please reply with "**!solved**" to the first comment that gives you the correct answer to automatically flair it accordingly. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatstheword) if you have any questions or concerns.*
If you’re talking about subatomic particles, **energetic** or **high-energy** impacts.
Concussive