[Talisker]

...most of its emission would be internal heat from the core. This would make Planet Nine more easily detectable at infrared wavelengths than through optical telescopes.

How lucky, then, that we just so happen to have the WISE infrared telescope in orbit.

And also isn't it interesting that the Vatican is running is own infrared observatory called, of all things, LUCIFER. Can't make this stuff up - gee, its almost like they're all expecting a very particular low light high heat object to appear in the sky...

[HiTech RedNeck]

The devil you say