The astral body is a hypothesized spiritual counterpart to the physical human body that is said to exist on a different plane.
According to yogic philosophy, humans have three bodies — the physical, the astral and the causal — which, together, are the vehicle of the soul. The astral body is more subtle than the physical body and it contains pranalife force, the senses and the mind.
In yoga, it is the astral body which contains prana and the the system of nadis energy channels that carry prana. These are sometimes known as astral tubes.