Title: वैकल्पिक

Text: Born in Poland, Copernicus studied mathematics and optics at Kracow. After 30 years of work, he put forward a theory that Earth rotates daily about its own axis, and that Earth and the other planets orbit the Sun with years of different lengths. This challenged the ancient belief that Earth was the center of the Universe. Copernicus was reluctant to publish his controversial theory, but other leading astronomers developed and expanded his theory after his death. प्रत्येक पराग्राफले परीक्षण हुनेछ।

Save test: यदि तपाईं यो टाइपिङ परीक्षणलाई साझा गर्न चाहानुहुन्छ भने यो प्रयोग गर्नुहोस् (केवल प्रमाणीकृत प्रयोगकर्ताहरूको लागि)।