Talk:Martian Madness/@comment-26488244-20150720165000/@comment-26808563-20150722113542

On the Martian Probe page in the comments, the user Pathogen answered how to get the probe to spawn. "Nothing more that you can really do other than the following: If you do these in order, you've got a pretty high chance of it spawning relatively soon. Space/Floating Island-level height has a higher spawn chance for the Probe."
 * 1) Go to a Floating Island/Space
 * 2) Set up a Water Candle (or few).
 * 3) Skybridge off to either side of you, extending at least another 10-50 blocks off-screen.
 * 4) Battle Potion in use.
 * 5) Wait.

I myself accidentally got two probes to spawn while building platforms high above the dungeon, underneath a Floating island(the dungeon has water candles inside) and then moved the water candles up on my platforms in hopes of getting a third one to spawn(which it did), all within ten minutes of unpaused game time.