Almost all of the ordinary matter (99.9999999% of it) is empty space. If you took out all of the space in our atoms, the entire human race (all 7.7 billion of us) would fit into the volume of a sugar cube.
Mars is red because its surface contains a lot of rust.
The hottest planet in the solar system is Venus, with an estimated surface temperature of 864 F (462 C).
There are about 100,000,000,000 stars in the Milky Way alone.
The Earth's average velocity orbiting the sun is 110,000 km per hour.
High and low tides are caused by the moon.
Hydrogen is the most abundant element in the Universe (75%).
The average distance between the Earth & the Moon is 238,855 miles (384,400 km).
The moon is 27% the size of the Earth.
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