21/Borisov
A Strange Interstellar Comet Discovery Hints at a Solar System Like Our Own
The "unexpected finding" of nickel gas around interstellar comet 21/Borisov lines up with "astonishing" new observations of local comets, scientists say.
Watch a Harvard Professor Explain Why He Thinks Aliens Visited Us Already
Most scientists think the first interstellar visitor to our solar system has a natural explanation. Harvard professor Avi Loeb makes the case for an alien origin.
NASA Captured Stunning New Images of the Interstellar Comet in Our Solar System
Unlike ʻOumuamua, the first interstellar object ever detected, comet 2I/Borisov is radiant and gassy.
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