Astral body is also known as the subtle body in which a person does the “spiritual traveling”. Here, people through the meditation can achieve this phenomenon. In Hinduism, the astral projection is the part of the astral plane or astral vehicle which provides an out-of-body experience.
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By Kundalini activation, you can get some powers that can make you capable of crossing any dimension. You need to be self-focused and when you feel peace of mind, you can do deep concentration inside the body. By practice, you can leave your physical body and then can travel in the Universe but you will be connected to your physical body by consciousness.
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