David S. F. Portreeさんのイラストまとめ

@nyrath @paul_drye It's a component of the Lunar Base Synthesis Study (1971), as I understand it. That spun off the Phase B Extension Space Station and IPP work.

This one is pretty neat, too: https://t.co/XwMFnXwCTD It describes a series of presentations at NASA HQ in 1963 pitching an expanded robotic exploration program. If you know 1960s robotic exploration history, you can guess how that went. "A" for effort, though.

Gentle reminder that I have a Patreon account. For as little as $1/mo you can access almost-daily Patron-only content - 90+ posts since 3 Oct 2019. Help support my blog - it's about spaceflight history, but it's also a wide-ranging guide to mission plans. https://t.co/LVBU2gXZsU

New DSFP's Spaceflight History post - "Flying Brickyard Postponed: A 1972-1973 Study of an Interim Ablative Space Shuttle Heat Shield" - https://t.co/IyAu4U92Ix

Do 1970s-vintage Solar Power Satellites count as megastructures? If not individually, than as a coordinated "fleet" with Earth surface assets? https://t.co/2onnASpvsA

How about a history of artificial gravity? I expect it would be part primer, part history, and a bit offbeat.

That certainly stirred things up!😀When I tweeted 3 hrs ago that 24 people had participated in my poll (see my Pinned Tweet), I didn't expect a surge in votes. Now it's up to 142! Can we make it to 250 before the poll ends Sunday? Thx to all who retweeted! #space #history #future

@runnymonkey The US had similar plans that got about as far as these did (not very).

Space history can be a tool for building the future. Space nostalgia cannot. https://t.co/hPNgTuPF2f

Dreaming a Different Apollo, Part Five: Victory Lap - https://t.co/teyA7RIpsD Spaceflight History @HumanoidHistory @AltHistoryHub @alt_historian @