
Space
If an antimatter meteor came into our solar system, how would we know?
Regulars
New ÒÁÈ˾þÃ's popular Last Word series gives readers the opportunity to answer each other's questions about everyday science phenomena, from the shape of scones to the evolutionary history of toenails. To answer a question or ask a new one, email lastword@newscientist.com
Issue no. 3569 published 15 November 2025