Emma Woollacott for TG Daily:
The launch of the Delta 2 rocket carrying the probes was initially scheduled for 8:37 am. Moving to this second launch window means it will head out on a 99-degree angle, a more southerly trajectory than would have been the case earlier.
The two Grail probes are designed to examine the interior of the moon and its gravitational field. They will fly in tandem orbits around the moon for several months, measuring its gravity field in great detail.
I had no idea we were sending spacecraft to the moon. Today. Hello, NASA PR?