Is social media good or bad for social unity?

We tend to talk about social media in sweeping terms: It's either the death knell for democracy or its savior. It's a tool to fight authoritarianism or a weapon to spread strategic misinformation. It polarizes us or pulls ...

Hubble captures rare 'light echo' from star explosion

When a star explodes (a supernova), it sends its intense burst of light out in all directions. On rare occasions, in the months and years that follow, rings of light or "light echoes" spread out from the original supernova ...

Who is falling for fake news?

People who read fake news online aren't doomed to fall into a deep echo chamber where the only sound they hear is their own ideology, according to a new study from the Wharton School.

Search reveals eight new sources of black hole echoes

Scattered across our Milky Way galaxy are tens of millions of black holes—immensely strong gravitational wells of spacetime, from which infalling matter, and even light, can never escape. Black holes are dark by definition, ...

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