Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
12
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
Some asteroids have other asteroids orbiting them.
131
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
Summer on Uranus lasts for 21 years.
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