Assertion: heliosphere | /r/HasProperty | vast region of space
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Source sentences:
text: At a time when scientists are unclear about the current location of NASA’s Voyager 1, which began its journey toward interstellar space in 1990, a new study has proposed a test to determine whether the spacecraft has indeed left the heliosphere, a vast region of space surrounding the sun.
text: The objective of this field of study is to understand the physics of the Sun and the heliosphere, the vast region of space influenced by the Sun.