The Solar System has a bubble shape. It is part of the Solar System everything that is within the area of influence of the Sun, up to where they reach their force of gravity, the solar wind and their magnetic field.
This bubble is called heliosphere, and floats through space orbiting around the center of our galaxy, the Milky Way ...
The outer edge of the heliosphere is called heliopause. Heliopause is the invisible frontier of the Solar System. It is the place where the solar wind loses speed and turns around. Wraps the heliosphere and protects it from external cosmic rays.
Heliopause is elastic. It expands and contracts, and can change shape and size. It is believed that at some time it was very contracted and the Solar System was exposed to many cosmic rays.
The limit of the heliopause is called termination shock. It is in contact with external radiation. From there begins the interstellar space. Currently, the Solar System is going through a small interstellar cloud that is pressing the termination crash and heliopause.
In 1977, NASA sent the Voyager I and II probes into space. After exploring the external Solar System, Voyager I entered the heliopause in 2005. It is now more than 17,000 million kilometers from Earth and continues to advance at more than 60,000 kilometers per hour.
Voyager I is the man-made object that has come so far and the first to leave the Solar System. Inside it has gold discs that contain information about Earth and life, as it was part of an extraterrestrial life search program supported by Carl Sagan. It also carries a map with our location in the Solar System.
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