The earth travels through space at 660,000 miles per hour.
189
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 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
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
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The Earth gets 100 tons heavier every day due to falling space dust.
673
The earth rotates more slowly on its axis in March than in September.
145