Why 2024's cicada emergence is so rare
[บีบีซีไทย] มุมมองใหม่ทางฟิสิกส์เสนอว่า การที่มนุษย์สังเกตเห็นห้วงจักรวาลแผ่ขยายออกไปเรื่อย ๆ นั้น เป็นเหมือนกับการเฝ้ามองภาพลวงตาที่ไม่มีอยู่จริง. ห้วงจักรวาลขยายตัวอาจเป็นเพียงปรากฏการณ์ “มิราจ” - BBC News ไทย ... ดูเพิ่มเติม
Periodical cicadas have a very strange lifecycle.
They spend 13 or 17 years underground (depending on the brood), and then suddenly emerge in their billions over the course of a few weeks.
And now, in 2024, an ultra rare "dual emergence" of cicadas is happening – with two different broods of emerging at the same time. It has not happened for 221 years – and won't happen again for another 221 years.
Cicada expert Dr Gene Kritsky explains it all.
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