It was very cold last night. I looked up at the sky and saw the Big Dipper very clearly. When the sky is clear enough for all the seven stars to be as brightly visible as they were then, you know it's going to be a very cold night.
Did you know? The Big Dipper “is an asterism of seven stars that has been recognized as a distinct grouping in many cultures from time immemorial. The component stars are the seven brightest of the formal constellation Ursa Major.” Wikipedia.
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Astronomy, physics, chemistry, mathematics