What is ectoplasm?
THIS IS THE SHELL LEFT BEHIND [at the death of the body]. ALSO, MANY FRAGMENTS NOW WHO ARE IN TEACHINGS, SUCH AS THE YOGIS, AND TO A CERTAIN EXTENT TEACHINGS SUCH AS THIS ONE, HAVE A SHORTER PERIOD OF ADJUSTMENT [to the astral plane] AS THEY ARE PREPARED FOR WHAT REALLY IS. “ECTOPLASM” IS ALSO USED TO REFER TO THE ASTRAL MATERIAL USED BY ADEPTS TO MATERIALIZE ASTRAL BEINGS AND PHENOMENA.
SOURCE: Michael Teachings Transcripts