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The Solar System Passed Through a Massive Cosmic Wave Millions of Years Ago — And This May Have Cooled Earth
The Solar System’s closest approach to Radcliffe, researchers estimate, occurred around 14 million years ago. This journey ...
National Geographic news2y
Planet Mars, explained
With a radius of 2,106 miles, Mars is the seventh largest planet in our solar system and about half the diameter of Earth. Its surface gravity is 37.5 percent of Earth’s. Mars rotates on its ...
National Geographic news4y
Planet Earth, explained
With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of ...