Every year in early January, Earth reaches the closest point in its orbit to the Sun, a moment astronomers call perihelion. We are slightly nearer to our star and receiving more solar energy than we ...
On Jan. 31, 1958, Explorer 1 became the first satellite launched by the United States. Its primary science instrument, a ...
As the year gets underway, something important happens quietly in space while life on Earth carries on as usual. Our planet reaches the point in its yearly path where it moves closest to the sun.
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