Which spacecraft first reached interstellar space?
Quick Answer
Voyager 1 was the first spacecraft to enter interstellar space, crossing the heliopause in 2012. Voyager 2 later followed in 2018.
The Full Story
Voyager 1, launched in 1977, became the first human-made object to enter interstellar space when it crossed the heliopause in 2012. That boundary marks the transition from the Sun’s bubble of solar wind to the interstellar medium. Voyager 1 continues to send back scientific measurements from beyond the Solar System’s protective region. Voyager 2 crossed the heliopause in 2018, giving scientists a second viewpoint on the edge of the Sun’s influence. Both spacecraft remain milestones of deep-space exploration.
Key Facts
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"The first spacecraft to leave the Sun’s bubble behind."
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