What is the heliopause?
Heliopause marks the edge of the solar system.
Heliopause marks the edge of the solar system i.e the edge of the Sun's gravitational pull. Heliopause lies somewhere beyond the Oort cloud which is about 100 Astronomical Units from the Sun. Heliopause is approximatel 123 Astronomical Units from the Sun. 1 Astronomical Unit is the distance from the Sun to the Earth, which at average is about 150 million kms.