A calamitous impact in space, with no visible evidence: the crash and merging of two black holes. Although, as seen in this intriguing image, if we could see gravitational waves the event would reveal not only immense power but a stunning image. [Read more about gravitational waves.]
(Image: © NASA/C. Henze)
Have a news tip, correction or comment? Let us know at firstname.lastname@example.org.