In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
The heart of an astronaut actually gets smaller when in outer space.
216
More than 20 million meteoroids enter Earth's atmosphere every day.
139
Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
16
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
Jupiter's moon Ganymede, is larger than the planet Mercury!
149