The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
A comet's tail always points away from the sun.
2
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221