1: NASA discovers mysterious X-shaped structures in Earth's upper atmosphere.

2: Scientists baffled by unexpected formations seen by NASA.

3: Unexplained anomalies spark debates among astronomers.

4: Could these shapes be signs of unknown atmospheric phenomena?

5: X-shaped structures defy current scientific explanations.

6: Researchers mystified by puzzling discoveries in Earth's skies.

7: NASA's observations raise questions about our understanding of the atmosphere.

8: The mystery of the X-shaped formations deepens as scientists seek answers.

9: New findings challenge our understanding of Earth's upper atmosphere.