There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Summer on Uranus lasts for 21 years.
358
The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
219
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Venus is the only planet that rotates clockwise.
310