What is the meaning of Interstellar ?

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At first glance, the answer seems simple. ‘Inter’ means between. ‘Stellar’ refers to stars. “Easy!” you think, “Interstellar space is the part of space that exists between stars

Not so fast! Wouldn’t that pretty much mean that all of space is interstellar space?

For interstellar space to be something different, then there must be some defined boundary between the space near a star and the space in between stars. But what is that boundary?

Scientists define the beginning of interstellar space as the place where the sun’s constant flow of material and magnetic field stop affecting its surroundings.

This place is called the heliopause. It marks the end of a region created by our sun that is called the heliosphere.

The sun creates this heliosphere by sending a constant flow of particles and a magnetic field out into space at over 670,000 miles per hour.

The boundary of what is known, that place known as the great frontier, has always intrigued and enticed us.

On the whole, this area of space is defined by its emptiness.