67: Unseen Planets:  "Not all of the Intra-Mercurial planets, nor yet those in the orbit of Neptune, are yet discovered, although they are strongly suspected.  We know that such exist and where they exist; and that there are innumerable planets "burnt out" they say,—in Obscuration we say;—planets in formation and not yet luminous, etc."...
"When so attached the 'tasimeter' will afford the possibility not only to measure the heat of the remotest of visible stars, but to detect by their invisible radiations stars that are unseen and otherwise undetectable, hence planets also.  The discoverer, an F. T. S., a good deal protected by M., thinks that if, at any point in a blank space of heavens—a space that appears blank even through a telescope of the highest power—the tasimeter indicates an accession of temperature and does so invariably; this will be a regular proof that the instrument is in range with the stellar body either non-luminous or so distant as to be beyond the reach of telescopic vision.  His tasimeter, he says, 'is affected by a wider range of etheric undulations than the Eye can take cognisance of.'  Science will Hear sounds from certain planets before she Sees them.  This is a Prophecy."—Mahatma Letters to A. P. Sinnett, p. 169.