> Wouldn't having them already up give a lot less warning in a first strike situation?

From GEO, no. From LEO, still probably no.

There may be a bird positioned just right so a small deörbit burn pots Moscow quicker than an ICBM could. But the moment you start burning, you’re caught. (Same as an ICBM.) And unless you have a really obvious orbital configuration that bunches a bunch of birds in a way useful for practically nothing but such a strike, you only get one or two such “early” shots before a wall of ICBMs would have landed.

Nukes in space aren’t about nuking the ground from space. It’s about space area denial through EMP.

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axus 3 days ago | parent [-]

Here's a fun snippet from Wikipedia's anti-satellite weapon page: https://en.wikipedia.org/wiki/Anti-satellite_weapon#Soviet_U...

"Elements within the Soviet space industry convinced Leonid Brezhnev that the Shuttle was a single-orbit weapon that would be launched from Vandenberg Air Force Base, manoeuvre to avoid existing anti-ballistic missile sites, bomb Moscow in a first strike, and then land. Although the Soviet military was aware these claims were false, Brezhnev believed them and ordered a resumption of [satellite destroyer] testing along with a Shuttle of their own."

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m4rtink 3 days ago | parent [-]

The exact claim might have been false, but at least i theory it could do this maneuver from orbit - e.g. during a regular space hab or satellite lunch mission it could dipp into the atmosphere, do a rapid oebit inclination chang using its wings, then boost back to orbit using the OMS. Next thing it would deliver the "totally science experiments" on the way to their targets once comming over the horizon. Maybe it could then even do the manuever again to either regain the old orbit parameters ir at least reach a more surivable random other one.

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JumpCrisscross 2 days ago | parent [-]

> at least i theory it could do this maneuver from orbit

Nukes from LEO aren't impossible. They're just impossible to do better than the current triad. Any breakthrough in propulsion that would make a plane change easier or less visible confers the same advantages to an ICBM. There is a narrow window in which orbital nuking can outperform, and that's almost entirely taken care of--and exceeded, in stealth--by SLBMs.

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throwaway290 2 days ago | parent [-]

Nuking from orbit was not literal. The point of sats is intercepting. Sats allow you to nuke the other guy while intercepting his rockets. Same result...

	▲	JumpCrisscross 2 days ago \| parent [-]
		> The point of sats is intercepting. Sats allow you to nuke the other guy while intercepting his rockets Space-based missile defence is not what’s implied by weapons that are “already up” and thus “give a lot less warning in a first strike situation?”