There are 4 books in the Lady Astronaut series. The newest book is The Martian Contingency which came out in 2025.

1
The Calculating Stars

Book cover of The Calculating Stars
A meteor decimates the U.S. government and paves the way for a climate cataclysm that will eventually render the earth inhospitable to humanity. This looming threat calls for a radically accelerated timeline in the earth's efforts to colonize space, as well as an unprecedented opportunity for a much larger share…
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2
The Fated Sky

Book cover of The Fated Sky
Continuing the grand sweep of alternate history laid out in The Calculating Stars, The Fated Sky looks forward to 1961, when mankind is well-established on the moon and looking forward to its next step: journeying to, and eventually colonising, Mars. Of course the noted Lady Astronaut Elma York would like…

3
The Relentless Moon

Book cover of The Relentless Moon

The Third in the Hugo, Nebula and Locus Award-Winning Series

Two worlds. One humanity.

It's 1963, and riots and sabotage plague the space program. The climate change caused by the Meteor is becoming more and more clear, but tensions are rising, and the IAC's goal of getting humanity off Earth…

4
The Martian Contingency

Book cover of The Martian Contingency

Years after a meteorite strike obliterated Washington, D.C. - triggering an extinction-level global warming event - Earth's survivors have started an international effort to establish homes on space stations and the Moon.

The next step - Mars.

Elma York, the Lady Astronaut, lands on the Red Planet, optimistic about preparing…