Science News - USA (2021-02-13)

http://www.sciencenews.org | February 13, 2021 17

To celebrate our upcoming 100th anniversary, we’ve launched

a series that highlights some of the biggest advances in science

over the last century. For more on our changing view of the

universe, and to see the rest of the series as it appears, visit the

Century of Science site at http://www.sciencenews.org/century

CASEY REED/PENN STATE

Neutron stars (one illustrated)

squash the mass equivalent of the

sun into the size of a city.

universe.indd 17universe.indd 17 1/27/21 9:37 AM1/27/21 9:37 AM