A total solar eclipse will sweep across parts of Greenland, Iceland, Spain and Portugal on August 12.
Sky-gazers will witness the first total solar eclipse from Spain's mainland since 1905.
Scientists will use the eclipse to study the sun's atmosphere and recreate a 1919 experiment that confirmed Einstein's theory of relativity.
AI-generated summary was reviewed by a CNN editor.
A total solar eclipse will create a celestial spectacle in the sky for the first time in more than two years on August 12.
