What dangers threaten us from outer space?

What dangers threaten us from outer space?

Earth is an island of life in the hostile ocean of space. The cold vacuum of space is full of dangerous radiation and high energy particles, not to mention objects of all shapes and sizes - from specks of dust to rocks, asteroids and comets - all hurtling around in every direction. It is reassuring to know that the Earth's magnetic field and its atmosphere protect us from many of these dangers.