
SCIENCE
NASA watched this supernova blast expand for 25 years
Back in 1604, Johannes Kepler discovered the Milky Way’s last naked-eye supernova. Here’s how NASA’s Chandra sees it over the 21st century.

Back in 1604, Johannes Kepler discovered the Milky Way’s last naked-eye supernova. Here’s how NASA’s Chandra sees it over the 21st century.
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