Last September, NASA officials were confident the Voyager 1 probe had passed into interstellar space. They weren’t 100% positive, though. Today, they are.
What makes researchers so sure today? Radiation from the sun described as a “tsunami wave” enabled scientists to calculate exactly how far away the Voyager 1 spacecraft is from Earth. The spacecraft sits over 11 billion miles from Earth and continues its trek into the unknown everyday.
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