On 23 July 2012, two eruptions on the sun known as coronal mass ejections
(CMEs) burst from an active patch of sunspots on the far side of the sun, which
is monitored by a probe that circles the sun ahead of Earth in the same orbit.
Emerging about 15 minutes apart, the CMEs quickly merged into one
shock wave of charged particles that washed over the probe’s
sensors just 18.6 hours later
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