Euclid was launched aboard a SpaceX Falcon 9 rocket on July 1 and reached its operational orbit at the second Sun-Earth Lagrange point (L2) four weeks later.
NASA administrator acknowledges the cost and schedule issues across some of its most challenging human deep-space exploration and space-science objectives.
An Ariane 5 heavy launcher is scheduled to lift off April 13 with a probe designed to determine whether Jupiter’s icy moons meet the conditions for life.