On Sunday, Dec. 21, at exactly 10:03 a.m. EST, the Northern Hemisphere's astronomical winter officially begins with the ...
Activity on the sun is not constant; it varies along a cycle of about 11 years. The peak of this solar cycle — called solar ...
Meteors from the Ursids appear near the Little Dipper, which is part of the constellation Ursa Minor. Only skywatchers in the ...
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