NASA’S VOYAGER SPACECRAFT, launched nearly a half century ago (1977), is still heading away from Earth, at a rate of 38,000 miles per hour. By the year 2025, it will be 48 years and 13.8 billion miles from Earth. A few years ago, it escaped the heliosphere, the outer fringe of our sun’s gravitational pull, having passed through a region of solar winds r…
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