The $488 million observatory is set to launch at the end of this month on a two-year mission to map the entire celestial sky.

This story was updated to add sky cover map at time of eclipse ... you can see the total lunar eclipse starting at 12:55 a.m.

A new kind of space telescope has embarked on a two-year mission to create four complete maps of the entire celestial sky that will catalog the origins of the universe and seek out the ingredients ...