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The Sound So Loud That It Circled the Earth Four Times
The 1883 eruption on Krakatoa may be the loudest noise the Earth has ever made.
Ingenious: Paul J. Steinhardt
The Princeton physicist on what’s wrong with inflation theory and his view of the Big Bang.
Can You Ever Really Know an Extraterrestrial?
Knowledge about aliens might be as dangerous as the aliens themselves.
What’s 250 Million Light-Years Big, Almost Empty, and Full of Answers?
Astronomers are using new tools in their search for cosmic voids.
