> It's hard to imagine, since the moonlandings, if America kept its pace in space exploration ...

The collapse of the USSR was the worst thing to happen to NASA.

I would suggest a watch of "We Stopped Dreaming" https://youtu.be/CbIZU8cQWXc

A less angry version (video and transcript of Neil DeGrasse Tyson testifying before the Senate's Science Committee on 7 March 2012) https://ifsa.my/articles/we-stopped-dreaming-by-neil-degrass...

    Let’s be honest with one anther.  We went to the Moon because we were at war with the Soviet Union. To think otherwise is delusion, leading some to suppose the only reason we’re not on Mars already is the absence of visionary leaders, or of political will, or of money. No. When you perceive your security to be at risk, money flows like rivers to protect us.

    But there exists another driver of great ambitions, almost as potent as war. That’s the promise of wealth. Fully funded missions to Mars and beyond, commanded by astronauts who, today, are in middle school, would reboot America’s capacity to innovate as no other force in society can. What matters here are not spin-offs (although I could list a few: Accurate affordable Lasik surgery, Scratch resistant lenses, Cordless power tools, Tempurfoam, Cochlear implants, the drive to miniaturize of electronics…) but cultural shifts in how the electorate views the role of science and technology in our daily lives.

    As the 1970s drew to a close, we stopped advancing a space frontier. The “tomorrow” articles faded. And we spent the next several decades coasting on the innovations conceived by earlier dreamers. They knew that seemingly impossible things were possible—the older among them had enabled, and the younger among them had witnessed the Apollo voyages to the Moon—the greatest adventure there ever was. If all you do is coast, eventually you slow down, while others catch up and pass you by.

The NASA/ESA Mars Sample Return mission has been canceled