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An ocean the size of the Arctic once covered half of Mars, new images hint

Mars may have been a "blue planet" with an ocean the size of today's Arctic Ocean, a new study suggests.

UPSC Essentials | Daily subject-wise quiz : Environment and Geography MCQs on rainfall in winters, ecological degradation of forests and more (Week 146)

Are you preparing for UPSC CSE Prelims 2026? Check your progress and revise your topics through this quiz on Environment and ...