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sun illustration

SIGNS OF LINES  The sun’s magnetic field is connected to one in the corona, which is much weaker and therefore harder to observe. Together, they form a twisted mess, illustrated here as white lines (based partly on a model) over a 2016 image of the sun from NASA’s Solar Dynamics Observatory.

hiker taking in view of mountains

ROCK BOTTOM  Earthquake vibrations are helping seismologists measure the depth of the ground we stand on.

time lapse of solar eclipse

Each day until August 21, astronomy writer Lisa Grossman will explore the top questions scientists will tackle during the 2017 total solar eclipse.

two photons bounce off each other

TRAVELING LIGHT  Particles of light can scatter off one another, a new study suggests. Researchers from the ATLAS experiment (illustrated) at the Large Hadron Collider detected events in which two photons (yellow beams) bounced off each other in collisions of lead nuclei.

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