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Answer for the clue "The boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium ", 10 letters:
heliopause

Alternative clues for the word heliopause

Word definitions for heliopause in dictionaries

Wikipedia Word definitions in Wikipedia
Heliopause are a U.K. band based in Belfast and Brighton , led by filmmaker Richard Davis. The band is known for performing in unusual locations such as May Street church, the Ulster Hall, the Palm House at Botanic Gardens, the dome over Belfast's Victoria ...

WordNet Word definitions in WordNet
n. the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind and the wind from other stars meet

Wiktionary Word definitions in Wiktionary
n. (context astronomy English) The boundary of heliosphere where the Sun's solar wind is stopped by the interstellar medium.

Usage examples of heliopause.

Indeed, as the Fiver sped toward the heliopause, they left the cabin, and the bed, only to eat, bathe, and do cursory checks of their progress.

Despite her good health, she started feeling queasy before they reached the heliopause of the second M-planet system.

They were three hours away from the heliopause when Helm announced receipt of an encrypted message from Admiral Gollanch.

Insystem drive at heliopause and are reducing our speed preparatory to landing at the coordinates on record.

They are already through the heliopause, the perimeter of the solar wind.

We've time in hand, I think, before the alien vessel gets anywhere near Aurigae's heliopause.

On its way from Earth to Venus, it discovered and measured the solar wind—the stream of charged particles that flows outward from the Sun, filling the magnetospheres of any planets in its way, blowing back the tails of comets, and establishing the distant heliopause.

Three years later the Mother Hive ship, a spherical leviathan, appears at Deneb heliopause.

A few deaths, a little expense, along the way must not deflect the nationalities from achieving our destiny, the conquest of all solar space, from the planet Mercury right out to the heliopause.

They were nearing the heliopause when Zainal mentioned quite casually, Kris thought, it was just possible that they might have a little trouble getting the second ship through the Balloon.

We crossed the heliopause, the invisible boundary where solar wind stops pushing away interstellar dust, and plunged on into deep space.