A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
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
Venus is the only planet that rotates clockwise.
310
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160