The human mind may find it difficult to conceptualize: a cosmic cloud so colossal it surrounds the sun and eight planets as it extends trillions of miles into deep space.

However, it's a once-in-a-lifetime opportunity as it won’t be back for another 80,000 years. The Oort Cloud comet, called C/2023 A3 Tsuchinshan-ATLAS, was discovered in 2023, approaching the inner ...

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An ancient visitor from the far reaches of our solar system is making a once-in-a-lifetime appearance. The Oort Cloud Comet, ...