1. Nasiruddin Tusi was the famous astronomer of Iran whom George Sarton attributes 64 scientific books and he also worked as scientific advisor to Halaku Khan.
2. Estimated age of the Universe is 13 billion years.
3. The first tourist in space was Dennis Tito.
4. International Date Line is mainly vertical.
5. Heat received by the Earth from the Sun is known as solar radiation.

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