I’ve been wondering this myself. I know they poured a LOT of $$$ into the Moon project, so that might be a big part: Nobody wants to shell out the $$$ now.
It was $25.4 billion in 1973 dollars. so in today’s $$ that’s: $152 billion today.
To compare: “Lawmakers reached agreement Monday on three spending bills that would provide about $147.5 billion next year for the departments of Veterans Affairs and Energy, Army Corps of Engineers and lawmakers’ offices and the Capitol complex.”
Current NASA budget is $21.5 billion.
Apollo was 1963-1972: 9 years. 9*21.5= $193 billion.
So, if we wanted to go back, we _could_ *if* NASA focused exclusively on it for 9 years, having 193-152=41. 41/9 yrs = $4.5 billion per year for anything not moon related. They’d have to cut their budget to 79% less (or operate on 1/5 current budget.
So, it’s _possible_, given a lot of assumptions here.
But I don’t know what the cost of materials (computers, raw ship parts), safety standards (we’ve learned a lot since 1973) would add up to.