AN INTERSTELLAR space rock zooming through our solar system may be the oldest comet ever seen by humans, according to ...

A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar ...

The object is big – possibly as wide 12 miles, larger than the asteroid that wiped out the dinosaurs – and is speeding ...

A mystery interstellar object spotted last week by astronomers could be the oldest comet ever seen, according to scientists.

Emily Kwong and Regina Barber of NPR's Short Wave talk about a comet visiting from interstellar space, caterpillars that eat ...