Sound doesn't travel in space.
255
There's a mysterious dwarf planet between Mars and Jupiter called 'Ceres' which has never been visited by spacecraft or photographed in detail, however, Earth-bound telescopes reveal a large bright shining spot on the surface of this planet, the origin and nature of which are unknown.
5
More than 20 million meteoroids enter Earth's atmosphere every day.
139
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The Earth gets 100 tons heavier every day due to falling space dust.
673
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160