A light-year is used for distance that the light has traveled for 1 year, so they saw the explosion in 1054 which means that it exploded back in the 5446, since it's 6500 light years away.
An atmospheric flow that transports vast amounts of moisture to regions outside of the tropics
Explanation:
Atmospheric rivers are relatively long, narrow regions in the atmosphere – like rivers in the sky – that transport most of the water vapor outside of the
