Julius Caesar was probably ancient Rome's most famous military commander and political leader. His administration also reformed the calendar.
Photograph by James L. Stanfield, National Geographic
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person who studies space and the universe beyond Earth's atmosphere.
to identify or associate with.
our planet, the third from the Sun. The Earth is the only place in the known universe that supports life.
(100 BCE-44 BCE) leader of ancient Rome.
to orbit or spin around something.
period of the year distinguished by special climatic conditions.
star at the center of our solar system.