Jonathan_S wrote:So you are targetting a planet that's got enough reaction capability that you need to try to hide the relativistic attack, yet so minimal a space presence that they didn't deploy the basic solar orbit system sensors to avoid people sneaking up on them from behind the sun?Loren Pechtel wrote:How to destroy a planet:
[snip]
Our rockpile is of course an x-ray source in the sky--but note that it's behind the star--the planet can't see it.
The trajectory I have picked will cause the rocks to miss the star by about 1 solar diameter, in the last 3.6 hours of flight (remember, lightspeed sensors) the planet will see an x-ray source slowly emerging from behind the star--that is, if they can make it out at all as a separate entity from the star. And who points telescopes at the local star, anyway??
Once it clears the star the planet has less than 3 minutes to detect it and intercept. There is no way to match orbits, thus the only defense is to interpose a wedge. From the response to Oyster Bay we can see that this would be hopelessly inadequate in stopping a pile of rocks that are spread across the planet. They'll get some, most will get through.
Nobody with even a basic space navy is going to rely exclusively on planetary, or planetary orbital, sensor to try and monitor the whole system. (Yes the other sensors will have a lightspeed lag to inform the planet of what they see, but even a relayed warning of a moving x-ray source 14 light hours away (20 hours from impact) should still give you a couple hours warning.
But ok, given a target that's blind to what's happening behind their own sun I guess that this attack would work - but it seems overkill to use relativistic boulders to attack such a weak system.
OrlandoNative wrote:Come from above or below the ecliptic. For some reason, while most of the systems are known to look "out", they don't seem to look up or down much. Probably because any planets, moons, and asteroid belts all tend to be in the same plane; and ship orbits reflect that.
Two dimensional thinking, Z minus 10K M? LOL