New NASA OIG report on SLS and Europa Clipper, slated to fly NET 2023:

"...if completed on schedule, the approximately $3 billion dollar Europa spacecraft will need to be stored for at least 2 years at a cost of $3 to $5 million per month until an SLS becomes available." pic.twitter.com/Fz8JNirCIM

— Emre Kelly (@EmreKelly) August 27, 2019